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

:root {
    --color-navy: #0a192f;
    --color-light-navy: #112240;
    --color-slate: #1e293b;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --color-white: #ffffff;
    --color-accent: #64748b;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 50%, #dbeafe 100%);
    color: var(--color-text-secondary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 2000;
    transition: var(--transition);
}

header.scrolled {
    box-shadow: 0 4px 30px rgba(10, 25, 47, 0.08);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
    position: relative;
}

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    letter-spacing: -1px;
    z-index: 2001;
    position: relative;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-navy);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--color-navy);
}

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

.cta-btn {
    padding: 0.875rem 1.75rem;
    background: var(--color-slate);
    color: var(--color-white) !important;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    box-shadow: 0 4px 14px rgba(30, 41, 59, 0.3);
}

.cta-btn:hover {
    background: var(--color-navy);
    color: var(--color-white) !important;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(10, 25, 47, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    z-index: 2001;
    position: relative;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--color-navy);
    transition: var(--transition);
    border-radius: 3px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    right: -100%;
    width: 85%;
    max-width: 350px;
    height: 100vh;
    background: var(--color-white);
    box-shadow: -8px 0 40px rgba(10, 25, 47, 0.15);
    transition: right 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1999;
    padding: 120px 40px 40px;
    overflow-y: auto;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu a {
    display: block;
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.25rem;
    margin-bottom: 2rem;
    transition: var(--transition);
    padding-left: 0;
}

.mobile-menu a:hover {
    color: var(--color-navy);
    transform: translateX(10px);
}

.mobile-menu .cta-btn {
    display: block;
    width: 100%;
    text-align: center;
    padding: 1rem 1.5rem;
    margin-top: 2rem;
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 25, 47, 0.6);
    z-index: 1998;
    opacity: 0;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(4px);
    /* Do not intercept pointer events when not active so mobile taps reach underlying elements */
    pointer-events: none;
}

.overlay.active {
    opacity: 1;
    /* Enable interaction when overlay is active */
    pointer-events: auto;
}

section {
    padding: 100px 0;
}

@media (max-width: 968px) {
    section {
        padding: 50px 0;
    }
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 100px;
    padding-bottom: 60px;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 10;
}

.hero-text h1 {
    font-size: 4.5rem;
    font-weight: 900;
    color: var(--color-navy);
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -2px;
}

.hero-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2rem;
    line-height: 1.3;
}

.hero-text p {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.8;
    max-width: 600px;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 2.5rem;
}

.tag {
    padding: 10px 20px;
    background: rgba(10, 25, 47, 0.05);
    border: 1.5px solid rgba(10, 25, 47, 0.1);
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-navy);
    transition: var(--transition);
}

.tag:hover {
    background: var(--color-navy);
    color: var(--color-white);
    border-color: var(--color-navy);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(10, 25, 47, 0.2);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-primary {
    padding: 1.2rem 2.5rem;
    background: var(--color-slate);
    color: var(--color-white);
    border: 2px solid var(--color-slate);
    border-radius: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    box-shadow: 0 6px 20px rgba(30, 41, 59, 0.3);
}

.btn-primary:hover {
    background: var(--color-navy);
    border-color: var(--color-navy);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(10, 25, 47, 0.4);
}

.btn-secondary {
    padding: 1.2rem 2.5rem;
    background: transparent;
    color: var(--color-navy);
    border: 2px solid var(--color-navy);
    border-radius: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background: var(--color-navy);
    color: var(--color-white);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(10, 25, 47, 0.2);
}

.hero-image-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-wrapper {
    position: relative;
    width: 420px;
    height: 420px;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(2deg); }
}

.profile-image {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 6px solid var(--color-navy);
    box-shadow: 0 25px 80px rgba(10, 25, 47, 0.25);
    transition: var(--transition);
    position: relative;
    z-index: 2;
}

.profile-image:hover {
    transform: scale(1.05);
    box-shadow: 0 30px 100px rgba(10, 25, 47, 0.35);
}

.profile-wrapper::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    border-radius: 50%;
    border: 2px dashed var(--color-accent);
    opacity: 0.3;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.canvas3d-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.12;
    pointer-events: none;
}

#canvas3d {
    width: 100%;
    height: 100%;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--color-medium-gray);
    text-align: center;
    margin-bottom: 3rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.card {
    background: var(--color-white);
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 30px;
    transition: var(--transition);
    cursor: pointer;
}

.card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(10, 25, 47, 0.15);
}

.card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: 1rem;
}

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

.skill-category {
    background: var(--color-white);
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 25px;
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--color-accent);
    box-shadow: 0 8px 25px rgba(10, 25, 47, 0.1);
}

.skill-category h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: 1rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.skill-tag {
    padding: 6px 14px;
    background: #e0e7ff;
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--color-navy);
    font-weight: 500;
    transition: var(--transition);
}

.skill-tag:hover {
    background: var(--color-navy);
    color: var(--color-white);
    transform: translateY(-2px);
}

.project-card {
    background: var(--color-white);
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(10, 25, 47, 0.15);
}

.project-content {
    padding: 25px;
    flex-grow: 1;
}

.project-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: 0.75rem;
}

.project-content p {
    font-size: 0.95rem;
    color: var(--color-medium-gray);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.project-footer {
    padding: 20px 25px;
    border-top: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.project-tag {
    font-size: 0.8rem;
    color: var(--color-medium-gray);
    font-weight: 500;
}

.project-link {
    font-size: 0.9rem;
    color: var(--color-navy);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--color-light-gray);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-light-navy));
}

.timeline-item {
    position: relative;
    padding-left: 40px;
    margin-bottom: 40px;
    transition: var(--transition);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 5px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-white);
    box-shadow: 0 0 0 2px #e2e8f0;
}

.timeline-item:hover {
    transform: translateX(10px);
}

.timeline-item h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: 0.5rem;
}

.timeline-item .company {
    font-size: 1rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-item ul {
    list-style: none;
    padding-left: 0;
}

.timeline-item li {
    font-size: 0.95rem;
    color: var(--color-medium-gray);
    margin-bottom: 0.5rem;
    padding-left: 20px;
    position: relative;
}

.timeline-item li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

footer {
    background: var(--color-navy);
    color: var(--color-white);
    padding: 80px 0 40px;
    text-align: center;
    border-top: 2px solid var(--color-accent);
}

footer h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-white), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

footer p {
    font-size: 1.1rem;
    color: #cbd5e1;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
    margin-bottom: 40px;
    flex-wrap: wrap; /* allow wrapping on small screens */
}

.social-links a {
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 14px;
    border: 1px solid var(--color-light-navy);
    border-radius: 8px;
}

.social-links a:hover {
    color: var(--color-white);
    background: var(--color-light-navy);
    border-color: var(--color-accent);
    transform: translateY(-3px);
}

.copyright {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-top: 40px;
}

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

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

@media (max-width: 968px) {
    .nav-links {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .mobile-menu {
        display: block;
    }

    .overlay {
        display: block;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .hero-text h2 {
        font-size: 1.5rem;
    }

    .profile-wrapper {
        width: 300px;
        height: 300px;
    }

    .canvas3d-container {
        width: 100%;
        opacity: 0.08;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 640px) {
    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-text h2 {
        font-size: 1.2rem;
    }

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

    .btn-primary,
    .btn-secondary {
        width: 100%;
        text-align: center;
    }

    .profile-wrapper {
        width: 250px;
        height: 250px;
    }

    /* Make social links compact on small screens to avoid horizontal overflow */
    .social-links {
        gap: 10px;
    }
    .social-links a {
        padding: 8px 10px;
        font-size: 0.9rem;
    }
}

/* Game Modal Styles */
.game-modal {
    display: none;
    position: fixed;
    z-index: 3000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 25, 47, 0.95);
    backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.game-modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.game-modal-content {
    background: var(--color-white);
    border-radius: 20px;
    padding: 2rem;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    position: relative;
    box-shadow: 0 25px 100px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.4s ease;

    /* Allow modal content to scroll when inner content is taller than max-height */
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.game-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--color-navy);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.game-close:hover {
    background: var(--color-slate);
    color: var(--color-white);
    transform: rotate(90deg);
}

/* Game layout: desktop two-column, mobile stacked with leaderboard above game */
.game-layout {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 15px;
}
.game-scene {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.game-hud {
    display: flex;
    justify-content: center;
    gap: 12px;
    align-items: center;
    margin-bottom: 6px;
}
.game-score {
    font-size: 1.1rem;
}
.game-speed {
    font-size: 0.95rem;
    color: rgba(0,0,0,0.6);
}
.game-scene canvas {
    width: 100%;
    height: 360px;
    border-radius: 10px;
    background: linear-gradient(180deg, #071427 0%, #071427 100%);
}
.game-controls {
    width: 220px;
    flex: 0 0 220px;
    display: flex;
    flex-direction: column;
}
.leaderboard-panel {
    background: rgba(30, 41, 59, 0.95);
    color: #fff;
    padding: 15px;
    border-radius: 10px;
    margin-top: 15px;
}
.leaderboard-panel {
    /* Prevent the leaderboard from growing outside the modal; allow internal scroll */
    max-height: 50vh;
    overflow: auto;
}
.leaderboard-panel h4 {
    margin: 0 0 10px 0;
    font-size: 0.95rem;
    text-align: center;
}
.leaderboard-loading {
    text-align: center;
    color: rgba(255,255,255,0.6);
    padding: 20px 0;
}

@media (max-width: 640px) {
    .game-layout {
        flex-direction: column-reverse; /* leaderboard on top, game below */
        gap: 12px;
    }
    .game-controls {
        width: 100%;
        flex: 0 0 auto;
        order: -1; /* ensure controls appear above scene in the DOM flow if needed */
    }
    .game-scene canvas {
        height: 280px;
    }
    .game-hud {
        justify-content: space-between;
        padding: 0 8px;
    }
}

.game-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-navy);
    text-align: center;
    margin-bottom: 1rem;
}

.game-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.game-score {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-slate);
}

.game-score span {
    color: var(--color-navy);
}

.game-instructions {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-style: italic;
}

#gameCanvas {
    width: 100%;
    height: 400px;
    border-radius: 12px;
    background: linear-gradient(135deg, #0a192f 0%, #112240 50%, #1e293b 100%);
    display: block;
}

.game-start-btn {
    width: 100%;
    padding: 12px 24px;
    background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.game-start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.5);
    background: linear-gradient(135deg, #0284c7 0%, #0891b2 100%);
}

.game-start-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(14, 165, 233, 0.3);
}

.game-restart {
    width: 100%;
    margin-top: 1rem;
}

@media (max-width: 640px) {
    .game-modal-content {
        padding: 1.5rem;
    }

    .game-title {
        font-size: 1.5rem;
    }

    #gameCanvas {
        height: 300px;
    }

    .game-info {
        flex-direction: column;
        align-items: flex-start;
    }
}