/* ===========================
   CSS Variables & Reset
   =========================== */

:root {
    /* Colors - Light Theme */
     /* Core Brand Colors */
    --primary-color: #1e3a8a;     /* Royal Blue */
    --secondary-color: #0f1e4d;   /* Deep Navy */
    --accent-color: #3b82f6;      /* Pure Blue Accent */

    /* Text Colors */
    --text-primary: #0f172a;      /* Navy-ish black */
    --text-secondary: #475569;    /* Slate blue gray */

    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f1f5f9;      /* Soft cool gray */

    /* Borders */
    --border-color: #cbd5e1;      /* Light slate */

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 50, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 80, 0.10);
    --shadow-lg: 0 10px 20px rgba(0, 0, 100, 0.15);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* Dark Theme */
[data-theme="dark"] {
     /* Text */
    --text-primary: #f1f5ff;       /* Soft cool white */
    --text-secondary: #a5b4fc;     /* Indigo-tinted text */

    /* Backgrounds */
    --bg-primary: #0a0f24;         /* Deep midnight navy */
    --bg-secondary: #111a36;       /* Slightly lighter blue-black */

    /* Borders */
    --border-color: #1e2a53;       /* Subtle royal border */

    /* Royal Blue System */
    --primary-color: #3b5bdb;      /* Bright royal blue */
    --secondary-color: #1e2a78;    /* Saturated navy blue */
    --accent-color: #4f8cff;       /* Glow-like blue accent */

    /* Shadows (lighter in dark mode for balance) */
    --shadow-sm: 0 1px 2px rgba(0, 20, 80, 0.4);
    --shadow-md: 0 4px 8px rgba(0, 20, 80, 0.5);
    --shadow-lg: 0 10px 20px rgba(0, 40, 120, 0.6);
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ===========================
   Typography
   =========================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

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

/* ===========================
   Container & Layout
   =========================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
    color: var(--text-primary);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* ===========================
   Navigation
   =========================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .navbar {
    background-color: rgba(15, 23, 42, 0.9);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--spacing-xs) 0;
    position: relative;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;         
        margin-right: auto;    
    }
}


.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: rotate(20deg);
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-content {
    text-align: center;
    animation: fadeInUp 1s ease;
}

.hero-greeting {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.hero-name {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
    padding-bottom : 0.1em;
}

.hero-title {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.typing-text {
    display: inline-block;
    border-right: 3px solid var(--primary-color);
    padding-right: 5px;
    animation: blink 0.7s infinite;
    vertical-align: top;
    box-sizing: content-box;
}

.hero-description {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 85%;
        max-width: 260px;
    }
}


.social-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.social-links a {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: all var(--transition-base);
}

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

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator a {
    font-size: 2rem;
    color: var(--text-secondary);
    animation: bounce 2s infinite;
}

/* ===========================
   About Section
   =========================== */

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    text-align: center;
}


.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}


.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: all var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-item h3 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.about-image {
    display: flex;
    justify-content: center;
}

.image-placeholder {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10rem;
    color: white;
    box-shadow: var(--shadow-xl);
}

.placeholder-img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

/* ===========================
   Skills Section
   =========================== */

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.category-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
    margin-bottom: var(--spacing-md);
}

.skill-category h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.skill-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.skill-tag {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

/* ===========================
   Projects Section
   =========================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-placeholder {
    font-size: 4rem;
    color: white;
}

.project-content {
    padding: var(--spacing-lg);
}

.project-content h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.project-content p {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.project-tags span {
    padding: 0.4rem 0.8rem;
    background: var(--bg-primary);
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
}

.project-link {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.project-link:hover {
    color: var(--secondary-color);
    transform: translateX(3px);
}

.project-link i {
    margin-right: 5px;
}

/* ===========================
   Experience Section
   =========================== */

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

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
}

.timeline-item {
    position: relative;
    padding-left: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.timeline-dot {
    position: absolute;
    left: -8px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 3px var(--primary-color);
}

.timeline-content {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
}

.timeline-date {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-content h4 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-content ul {
    margin-top: var(--spacing-sm);
    padding-left: var(--spacing-lg);
}

.timeline-content li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* ===========================
   Contact Section
   =========================== */

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.contact-item i {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 12px;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.contact-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.contact-item p,
.contact-item a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-status {
    margin-top: 1rem;
    font-size: 0.9rem;
}

.form-status.success {
    color: #16a34a;
}

.form-status.error {
    color: #dc2626;
}


/* ===========================
   Footer
   =========================== */

.footer {
    background: var(--bg-secondary);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--border-color);
}

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

.footer-content p {
    color: var(--text-secondary);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: all var(--transition-base);
}

.footer-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

/* ===========================
   Animations
   =========================== */

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

@keyframes blink {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0;
    }
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--bg-primary);
        width: 100%;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-base);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .timeline::before {
        left: 10px;
    }
    
    .timeline-item {
        padding-left: 50px;
    }
    
    .timeline-dot {
        left: 2px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .image-placeholder {
        width: 200px;
        height: 200px;
        font-size: 7rem;
    }
}