:root {
    /* Light theme */
    --text-color: #2d3748;
    --background-color: #f7fafc;
    --primary-color: #4299e1;
    --secondary-color: #48bb78;
    --surface-color: #ffffff;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --border-radius: 12px;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --max-width: 1200px;
    --padding: 24px;
    --transition: all 0.3s ease;

    /* Calm Dark theme */
    --dark-text-color: #e2e8f0;
    --dark-background-color: #1a1f2e;  /* Deep blue-grey */
    --dark-primary-color: #7fb3ec;     /* Soft blue */
    --dark-secondary-color: #8cd4b9;   /* Soft teal */
    --dark-surface-color: #242b3d;     /* Lighter blue-grey */
    --dark-hover-color: #2d364a;       /* Slightly lighter surface color */
    --dark-box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    --dark-border-color: #2f3a4f;      /* Subtle border color */
    --dark-muted-text: #a0aec0;        /* Muted text for less important content */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: var(--transition);
}

body {
    font-family: var(--font-family);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--background-color);
}

body.dark-mode {
    color: var(--dark-text-color);
    background-color: var(--dark-background-color);
}

body.dark-mode nav {
    background-color: var(--dark-secondary-color);
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 3rem 0;
    margin-bottom: 2rem;
    clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
}

body.dark-mode header {
    background: linear-gradient(135deg, var(--dark-primary-color), var(--dark-secondary-color));
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

nav {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

body.dark-mode nav {
    background-color: var(--dark-secondary-color);
}

body.dark-mode .project {
    box-shadow: var(--dark-box-shadow);
}

nav ul {
    list-style-type: none;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 1rem;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: var(--primary-color);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}



.projects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
}

.project:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.project img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: var(--transition);
}

.project:hover img {
    transform: scale(1.05);
}

.project-info {
    padding: 1.5rem;
}

.project h3 {
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.project p {
    margin-bottom: 1rem;
    color: var(--text-color);
}

body.dark-mode .project p {
    color: var(--dark-text-color);
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    z-index: 1;
    margin-right: 0.5rem;
    color: white;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
}

body.dark-mode .btn-secondary {
    background-color: var(--dark-secondary-color);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
    transition: 0.6s;
    z-index: -1;
}

.btn:hover::before {
    transform: translateX(100%);
}

#toggle-dark-mode {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px;
    background-color: var(--surface-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--box-shadow);
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
}

body.dark-mode #toggle-dark-mode {
    background-color: var(--dark-surface-color);
    box-shadow: var(--dark-box-shadow);
}

@media (max-width: 768px) {
    :root {
        --padding: 16px;
    }

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

    header {
        clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
    }
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

body.dark-mode ::-webkit-scrollbar-track {
    background: var(--dark-background-color);
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: var(--dark-primary-color);
}

.btn:hover {
    background-color: var(--secondary-color);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.skill-item {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
}

body.dark-mode .skill-item {
    background-color: var(--dark-surface-color);
    box-shadow: var(--dark-box-shadow);
}



body.dark-mode .skill-item:hover {
    background: linear-gradient(145deg, var(--dark-surface-color), var(--dark-hover-color));
}

.skill-item i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.contact-links {
    list-style-type: none;
    margin-top: 1rem;
}

.contact-links li {
    margin-bottom: 0.5rem;
}

.contact-links i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

footer {
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

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



.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.skill-item {
    background-color: white;
    border-radius: 10px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.skill-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.skill-item::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0) 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.skill-item:hover::before {
    opacity: 1;
    animation: shine 1.5s infinite;
}

@keyframes shine {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.skill-item i {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.skill-item:hover i {
    transform: scale(1.2);
}

.skill-item:hover {
    transform: translateY(-5px);
    background: linear-gradient(145deg, var(--surface-color), var(--background-color));
}

.skill-item span {
    display: block;
    font-weight: bold;
    color: var(--secondary-color);
    transition: all 0.3s ease;
}

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

.skill-level {
    width: 100%;
    height: 6px;
    background-color: #e0e0e0;
    border-radius: 3px;
    margin-top: 0.75rem;
    overflow: hidden;
}

.skill-level-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 3px;
    transform-origin: left;
    transition: transform 1s ease-out;
}

.skill-item:hover .skill-level-fill {
    animation: fillAnimation 1s ease-out forwards;
}


.skills-grid .skill-item {
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

#google-play-btn {
    display: inline-block;
    padding: 10px 20px;
    margin: 5px;
    font-size: 16px;
    color: white;
    background-color: #007BFF;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

#google-play-btn:hover {
    background-color: #0056b3;
}

#github-repo-btn {
    display: inline-block;
    padding: 10px 20px;
    margin: 5px;
    font-size: 16px;
    color: white;
    background-color: #28a745;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

#github-repo-btn:hover {
    background-color: #218838;
}

#skills, #projects {
    background: #fff;
    padding: var(--padding);
    margin: 20px auto;
    max-width: var(--max-width);
    box-shadow: var(--box-shadow);
    border-radius: var(--border-radius);
    animation: fadeIn 2s ease-in-out;
    text-align: justify;
}

#skills h2, #projects h2 {
    font-size: 2em;
    margin-bottom: 10px;
    color: var(--primary-color);
    text-align: center;
}

button#toggle-dark-mode {
    position: fixed;
    top: 10px;
    right: 10px;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
}

button#toggle-dark-mode:hover {
    transform: rotate(360deg);
}

body.dark-mode button#toggle-dark-mode {
    background-color: var(--dark-primary-color);
}


/* Animation refinements */
@keyframes fillAnimation {
    0% {
        transform: scaleX(0);
    }
    100% {
        transform: scaleX(1);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


.fade-in {
    animation: fadeIn 1s ease-in;
}


.skills-grid .skill-item:nth-child(1) { animation-delay: 0.1s; }
.skills-grid .skill-item:nth-child(2) { animation-delay: 0.2s; }
.skills-grid .skill-item:nth-child(3) { animation-delay: 0.3s; }
.skills-grid .skill-item:nth-child(4) { animation-delay: 0.4s; }
.skills-grid .skill-item:nth-child(5) { animation-delay: 0.5s; }
.skills-grid .skill-item:nth-child(6) { animation-delay: 0.6s; }
.skills-grid .skill-item:nth-child(7) { animation-delay: 0.7s; }
.skills-grid .skill-item:nth-child(8) { animation-delay: 0.8s; }