/* =========================================
   1. VARIABLES & THEME SETUP
   ========================================= */
:root {
    /* Color Palette - Dark Mode (Default) */
    /* Using a sophisticated teal/emerald tone mixed with deep slate for a "Science & Nature" feel */
    --bg-primary: #0f1115;
    --bg-secondary: #161b22;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;

    --accent-color: #2ea043;
    /* Scientific Green/Emerald */
    --accent-hover: #3fb950;
    --accent-gradient: linear-gradient(135deg, #2ea043 0%, #238636 100%);
    --accent-gradient-text: linear-gradient(135deg, #7ee787 0%, #aff5b4 100%);

    --card-bg: rgba(255, 255, 255, 0.04);
    --border-color: rgba(240, 246, 252, 0.1);

    /* Spacing & Layout */
    --container-width: 1200px;
    --header-height: 80px;
    --section-spacing: 100px;

    /* Typography */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Transitions */
    --transition-base: 0.3s ease;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --text-primary: #24292f;
    --text-secondary: #57606a;

    --accent-color: #0969da;
    /* Professional Blue for clear contrast */
    --accent-hover: #218bff;
    --accent-gradient: linear-gradient(135deg, #0969da 0%, #0550ae 100%);
    --accent-gradient-text: linear-gradient(135deg, #0969da 0%, #0550ae 100%);

    --card-bg: #ffffff;
    --border-color: #d0d7de;
}

/* =========================================
   2. GLOBAL RESET & BASE STYLES
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.3;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* =========================================
   3. UTILITIES & COMPONENTS
   ========================================= */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: var(--section-spacing) 0;
}

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

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-gradient);
    margin-top: 8px;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-weight: 300;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    border-radius: 8px;
    font-weight: 600;
    transition: all var(--transition-base);
    font-size: 1rem;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.3);
    filter: brightness(1.1);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    margin-left: 1rem;
}

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

.full-width {
    width: 100%;
    margin-left: 0;
}

/* =========================================
   4. NAVIGATION
   ========================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(15, 17, 21, 0.85);
    /* Matches Bg-primary */
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-base);
}

[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.85);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    font-family: var(--font-heading);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 5px 0;
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-btn {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.9rem;
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: all var(--transition-base);
}

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

#theme-toggle {
    color: var(--text-primary);
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle:hover {
    background: var(--border-color);
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="light"] .sun-icon {
    display: block;
}

[data-theme="light"] .moon-icon {
    display: none;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-base);
}

.hamburger.toggle span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

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

.hamburger.toggle span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}


/* =========================================
   5. HERO SECTION
   ========================================= */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    position: relative;
    /* Subtle modern mesh gradient */
    background: radial-gradient(circle at 10% 20%, rgba(46, 160, 67, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(9, 105, 218, 0.05) 0%, transparent 40%);
}

.hero-content {
    max-width: 900px;
}

.hero-greeting {
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1.125rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero-name {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: var(--accent-gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

[data-theme="light"] .hero-name {
    background: linear-gradient(135deg, #1f2328 0%, #424a53 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-titles {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: 400;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.separator {
    color: var(--accent-color);
    font-weight: bold;
}

.hero-intro {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 700px;
}

/* =========================================
   6. ABOUT SECTION
   ========================================= */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: center;
}

/* Elegant Profile Image with Float Animation */
.about-image-wrapper {
    position: relative;
    border-radius: 20px;
    height: 450px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    z-index: 1;
    overflow: hidden;
    /* Keeps image inside border radius */
    animation: float 6s ease-in-out infinite;
    /* Continuous floating movement */
}

/* Gradient Border Effect */
.about-image-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 20px;
    padding: 3px;
    /* Border thickness */
    background: var(--accent-gradient);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    z-index: 2;
    /* On top of image */
    pointer-events: none;
    opacity: 0.8;
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

/* Elegant Hover Effect */
.about-image-wrapper:hover .profile-image {
    transform: scale(1.1);
}

.about-image-wrapper:hover {
    box-shadow: 0 35px 60px -15px rgba(46, 160, 67, 0.3);
}

/* Floating Animation Keyframes */
@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-15px);
    }

    100% {
        transform: translateY(0px);
    }
}

.about-description p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.about-description strong {
    color: var(--accent-color);
}

/* =========================================
   7. SKILLS SECTION
   ========================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.skill-category {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 12px;
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.skill-category:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.skill-category h3 {
    margin-bottom: 20px;
    font-size: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

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

.skill-tags span {
    background: rgba(127, 236, 137, 0.08);
    color: var(--text-primary);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

[data-theme="light"] .skill-tags span {
    background: rgba(9, 105, 218, 0.08);
    color: #0969da;
    border-color: rgba(9, 105, 218, 0.2);
}

/* =========================================
   8. PROJECTS SECTION
   ========================================= */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 32px -12px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-color);
}

.project-image {
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 1.5rem;
    text-align: center;
    line-height: 1.2;
    padding: 24px;
}

/* Gradients for project placeholders */
.gradient-1 {
    background: linear-gradient(135deg, #FF9966, #FF5E62);
}

.gradient-2 {
    background: linear-gradient(135deg, #56CCF2, #2F80ED);
}

.gradient-3 {
    background: linear-gradient(135deg, #11998e, #38ef7d);
}

.gradient-4 {
    background: linear-gradient(135deg, #8E2DE2, #4A00E0);
}

.project-content {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.project-content h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
    flex-grow: 1;
}

.link-item {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-color);
    display: inline-flex;
    align-items: center;
}

.link-item:hover {
    text-decoration: underline;
}

/* =========================================
   9. EXPERIENCE SECTION
   ========================================= */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 0;
    height: 100%;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 48px;
    width: 100%;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-date {
    width: 45%;
    text-align: right;
    padding-right: 40px;
    color: var(--accent-color);
    font-weight: 600;
    font-family: var(--font-heading);
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.timeline-item:nth-child(odd) .timeline-date {
    text-align: left;
    padding-right: 0;
    padding-left: 40px;
    justify-content: flex-start;
}

.timeline-content {
    width: 45%;
    background: var(--card-bg);
    padding: 28px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    position: relative;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 20px;
    right: -6px;
    width: 12px;
    height: 12px;
    background: var(--card-bg);
    transform: rotate(45deg);
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    z-index: 1;
}

.timeline-item:nth-child(odd) .timeline-content::before {
    left: -6px;
    right: auto;
    border-right: none;
    border-top: none;
    border-left: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

/* Timeline Dot */
.timeline-content::after {
    content: '';
    position: absolute;
    top: 24px;
    left: -55px;
    /* Adjust based on gap */
    width: 16px;
    height: 16px;
    background: var(--bg-primary);
    border: 3px solid var(--accent-color);
    border-radius: 50%;
    z-index: 10;
}

.timeline-item:nth-child(odd) .timeline-content::after {
    left: auto;
    right: -55px;
}

.company {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* =========================================
   10. SERVICES & OBJECTIVE
   ========================================= */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.service-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 12px;
    text-align: center;
    transition: transform var(--transition-base);
}

.service-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.service-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.objective-section {
    padding: 80px 0;
}

.objective-text {
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--text-primary);
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.8;
    position: relative;
    padding: 0 40px;
}

.objective-text::before,
.objective-text::after {
    content: '"';
    font-size: 3rem;
    color: var(--accent-color);
    position: absolute;
    opacity: 0.3;
}

.objective-text::before {
    top: -20px;
    left: 0;
}

.objective-text::after {
    bottom: -40px;
    right: 0;
}

/* =========================================
   11. CONTACT & FOOTER
   ========================================= */
.contact-container {
    max-width: 600px;
    text-align: center;
}

.contact-form {
    text-align: left;
    margin-bottom: 48px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    /* Slightly different than card for input */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(46, 160, 67, 0.2);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-links a {
    color: var(--text-secondary);
    transition: all var(--transition-base);
    padding: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.back-to-top {
    font-weight: 600;
    color: var(--accent-color);
}

/* =========================================
   12. ANIMATIONS
   ========================================= */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

.fade-in.left {
    transform: translateX(-30px);
}

.fade-in.right {
    transform: translateX(30px);
}

.fade-in.left.visible,
.fade-in.right.visible {
    transform: translateX(0);
}

.delay-1 {
    transition-delay: 0.1s;
}

.delay-2 {
    transition-delay: 0.2s;
}

.delay-3 {
    transition-delay: 0.3s;
}

/* =========================================
   13. MEDIA QUERIES
   ========================================= */
@media (max-width: 968px) {
    .container {
        padding: 0 20px;
    }

    .hero-name {
        font-size: 3rem;
    }

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

    .about-image-wrapper {
        height: 350px;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        flex-direction: column !important;
        margin-left: 20px;
    }

    .timeline-date {
        width: 100%;
        text-align: left;
        padding: 0 0 10px 40px;
        justify-content: flex-start;
    }

    .timeline-content {
        width: 100%;
        margin-left: 30px;
    }

    .timeline-content::before {
        left: -6px !important;
        right: auto !important;
        border-top: none !important;
        border-right: none !important;
        border-left: 1px solid var(--border-color);
        border-bottom: 1px solid var(--border-color);
    }

    .timeline-content::after {
        left: -39px !important;
        right: auto !important;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: var(--bg-primary);
        padding: 24px;
        border-bottom: 1px solid var(--border-color);
        gap: 20px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
    }

    .nav-links.active {
        display: flex;
        animation: slideDown 0.3s ease-out;
    }

    .hamburger {
        display: flex;
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .hero-titles {
        flex-direction: column;
        gap: 4px;
        align-items: flex-start;
    }

    .separator {
        display: none;
    }

    .hero-section {
        align-items: center;
        justify-content: center;
    }

    .hero-content {
        text-align: left;
        /* Keep left alignment for professional look, or center? Let's use left mobile */
    }

    /* Center aligning hero on very small screens often looks better */
    @media (max-width: 480px) {
        .hero-content {
            text-align: center;
        }

        .hero-titles {
            align-items: center;
        }

        .hero-buttons {
            justify-content: center;
        }
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }

        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}