/* ========================================
   CSS Variables & Theme
   ======================================== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #06b6d4;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-card: #ffffff;
    --text: #0f172a;
    --text-light: #334155;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-hover: 0 8px 40px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --nav-bg: rgba(255,255,255,0.92);
    --timeline-line: #e2e8f0;
    --code-bg: #f1f5f9;
    --code-border: #e2e8f0;
}

[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --accent: #22d3ee;
    --bg: #000000;
    --bg-alt: #0f0f0f;
    --bg-card: #111111;
    --text: #f0f0f0;
    --text-light: #c8c8c8;
    --text-muted: #888888;
    --border: #222222;
    --shadow: 0 4px 24px rgba(0,0,0,0.5);
    --shadow-hover: 0 8px 40px rgba(0,0,0,0.7);
    --nav-bg: rgba(0,0,0,0.92);
    --timeline-line: #222222;
    --code-bg: #111111;
    --code-border: #222222;
}

/* ========================================
   Reset & Base
   ======================================== */
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; font-size:16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition), border-color var(--transition);
}
.header .container { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text) !important;
    background: var(--bg-alt);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    letter-spacing: -0.5px;
}
.nav-list { display: flex; gap: 8px; }
.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text) !important;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background var(--transition), color var(--transition);
}
.nav-link:hover { background: var(--bg-alt); color: var(--primary) !important; }
.header-actions { display: flex; align-items: center; gap: 12px; }

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 10px;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background var(--transition), border-color var(--transition);
    color: var(--text);
}
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: inline; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* Menu Toggle (mobile) */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.menu-toggle span {
    display: block;
    width: 26px;
    height: 2.5px;
    background: var(--text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0 80px;
    background: var(--bg);
    position: relative;
    overflow: hidden;
}
.hero .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
.hero-content {
    max-width: 720px;
}
.hero-greeting {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.hero-name {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-title {
    font-size: 1.3rem;
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 12px;
}
.hero-tagline {
    font-size: 1.05rem;
    color: var(--text-light);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}
.hero-buttons { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-decoration: none !important;
}
.btn-primary { background: var(--primary); color: #fff !important; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.35); }
.btn-secondary {
    background: transparent;
    border-color: var(--border);
    color: var(--text) !important;
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary) !important; transform: translateY(-2px); }
.btn-outline {
    background: transparent;
    border-color: var(--primary);
    color: var(--primary) !important;
}
.btn-outline:hover { background: var(--primary); color: #fff !important; transform: translateY(-2px); }

/* Hero Visual - Code Block */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}
.code-block {
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: var(--radius);
    padding: 28px;
    font-size: 0.9rem;
    line-height: 1.8;
    box-shadow: var(--shadow);
    min-width: 320px;
    transition: background var(--transition);
}
.code-block pre { font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace; color: var(--text); }
.code-block .keyword { color: #c678dd; }
.code-block .class-name { color: #e5c07b; }
.code-block .this { color: #61afef; }
.code-block .prop { color: #e06c75; }
.code-block .string { color: #98c379; }

/* ========================================
   Section Common
   ======================================== */
.section { padding: 100px 0; }
.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 48px;
    text-align: center;
    position: relative;
}
.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 4px;
    margin: 12px auto 0;
}

/* ========================================
   About Section
   ======================================== */
.about { background: var(--bg-alt); transition: background var(--transition); }
.about-content { max-width: 820px; margin: 0 auto; }
.about-text p { font-size: 1.08rem; margin-bottom: 18px; color: var(--text-light); }
.about-text strong { color: var(--text); }


/* ========================================
   Skills Section
   ======================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}
.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.skill-category:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary-light); }
.skill-category-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 18px;
    color: var(--text);
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.skill-tag {
    padding: 6px 16px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-light);
    transition: all var(--transition);
}
.skill-tag:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ========================================
   Experience - Timeline
   ======================================== */
.experience { background: var(--bg-alt); transition: background var(--transition); }
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--timeline-line);
    transition: background var(--transition);
}
.timeline-item {
    position: relative;
    margin-bottom: 40px;
    padding-left: 20px;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
    position: absolute;
    left: -34px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg-alt);
    box-shadow: 0 0 0 2px var(--primary);
    z-index: 1;
}
.timeline-date {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}
.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 28px;
    transition: transform var(--transition), box-shadow var(--transition);
}
.timeline-content:hover { transform: translateX(6px); box-shadow: var(--shadow-hover); }
.timeline-content h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 4px; }
.timeline-sub { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 12px; }
.timeline-content ul { padding-left: 18px; }
.timeline-content li {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 8px;
    list-style: disc;
    line-height: 1.6;
}

/* ========================================
   Projects Section
   ======================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
}
.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}
.project-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.project-card:hover::before { transform: scaleX(1); }
.project-icon {
    font-size: 2rem;
    margin-bottom: 14px;
    display: inline-block;
}
.project-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.project-desc { font-size: 0.93rem; color: var(--text-light); line-height: 1.6; margin-bottom: 16px; }
.project-tech { display: flex; flex-wrap: wrap; gap: 8px; }
.project-tech span {
    padding: 4px 12px;
    background: var(--bg-alt);
    border-radius: 16px;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* ========================================
   Education Section
   ======================================== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}
.education-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}
.education-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.edu-icon { font-size: 2.4rem; margin-bottom: 12px; display: block; }
.education-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.edu-institute { font-size: 0.92rem; color: var(--text-light); margin-bottom: 4px; }
.edu-year { font-size: 0.85rem; color: var(--text-muted); font-weight: 600; }

/* ========================================
   Languages Section
   ======================================== */
.languages { background: var(--bg-alt); transition: background var(--transition); }
.languages-list { max-width: 500px; margin: 0 auto; display: flex; flex-direction: column; gap: 24px; }
.language-item { display: flex; flex-direction: column; gap: 8px; }
.lang-name { font-size: 1rem; font-weight: 600; }
.lang-bar {
    width: 100%;
    height: 10px;
    background: var(--border);
    border-radius: 10px;
    overflow: hidden;
}
.lang-progress {
    height: 100%;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 1s ease;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-content { max-width: 600px; margin: 0 auto; text-align: center; }
.contact-intro { font-size: 1.08rem; color: var(--text-light); margin-bottom: 36px; }
.contact-details { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 1.05rem;
}
.contact-icon { font-size: 1.3rem; color: var(--text-light); }
.contact-item a { color: var(--text-light) !important; transition: color var(--transition); }
.contact-item a:hover { color: var(--primary) !important; }

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ========================================
   Scroll 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); }

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 968px) {
    .hero-name { font-size: 2.8rem; }
    .hero-tagline { font-size: 1rem; }
    .section-title { font-size: 1.9rem; }
}

@media (max-width: 768px) {
    .nav-list { display: none; }
    /*.nav-list.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--nav-bg);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        padding: 16px 24px;
        gap: 4px;
    }*/
    .nav-list.active {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 68px;
        right: 0;
        width: 300px; /* adjust width */
        background: var(--nav-bg);
        backdrop-filter: blur(16px);
        border-left: 1px solid var(--border);
        padding: 12px;
        gap: 2px; /* small gap */
        z-index: 999;
        height: calc(100vh - 68px);
    }
    /* Added newly from */
    .nav-list.active .nav-link {
        display: block;
        padding: 10px 12px;
        font-size: 0.95rem;
        text-align: left;
        margin-left: 18px;
    }
    .menu-toggle,
    .nav-link {
        -webkit-tap-highlight-color: transparent;
    }
    /* upto here */
    .menu-toggle { display: flex; }
    .hero { padding: 80px 0 60px; }
    .hero-name { font-size: 2.2rem; }
    .hero-title { font-size: 1.1rem; }
    .btn { padding: 10px 22px; font-size: 0.88rem; }
    .section { padding: 72px 0; }
    .section-title { font-size: 1.7rem; margin-bottom: 36px; }
    .skills-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .education-grid { grid-template-columns: 1fr; }

    .timeline { padding-left: 30px; }
    .timeline-dot { left: -24px; width: 12px; height: 12px; }
    .timeline-content { padding: 18px 20px; }

}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-name { font-size: 1.9rem; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; }
}