/* Main Portfolio Stylesheet */

:root {
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --primary-accent: #0db49e;
    --primary-accent-hover: #0a9381;
}

.theme-light {
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-nav: rgba(248, 250, 252, 0.8);
    --border-color: rgba(226, 232, 240, 0.8);
    --text-main: #0f172a;
    --text-muted: #475569;
    --primary: #0db49e;
    --primary-hover: #0a9381;
    --primary-light: #e6f7f4;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --accent-glow: rgba(13, 180, 158, 0.15);
}

.theme-dark {
    --bg-body: #090d16;
    --bg-card: #111827;
    --bg-nav: rgba(9, 13, 22, 0.8);
    --border-color: rgba(31, 41, 55, 0.8);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #0db49e;
    --primary-hover: #0a9381;
    --primary-light: #0f3b36;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --accent-glow: rgba(13, 180, 158, 0.25);
}

/* Global Styles */
body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-muted);
    background-color: var(--bg-body);
    transition: background-color 0.5s ease, color 0.5s ease;
}

@media (min-width: 992px) {
    body {
        padding-top: 72px;
        padding-left: 0 !important;
    }
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

h1 {
    font-size: 3.5rem;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.03em;
}

h2 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
}

h3 {
    font-size: 1.35rem;
}

p.lead {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--text-muted);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
    text-decoration: none;
}

/* Sticky Header Navigation */
#sideNav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 72px;
    display: flex;
    align-items: center;
    background-color: var(--bg-nav) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
    transition: var(--transition);
}

#sideNav .navbar-brand {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
    color: var(--text-main) !important;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#sideNav .navbar-brand .img-profile-nav {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary);
}

#sideNav .navbar-nav {
    flex-direction: row !important;
    align-items: center;
    gap: 1.5rem;
    margin-left: auto;
}

#sideNav .nav-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted) !important;
    text-transform: none !important;
    letter-spacing: 0 !important;
    padding: 0.5rem 0 !important;
    position: relative;
    transition: var(--transition);
}

#sideNav .nav-link:hover,
#sideNav .nav-link.active {
    color: var(--text-main) !important;
}

#sideNav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

#sideNav .nav-link:hover::after,
#sideNav .nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Theme Switcher Toggle */
.theme-switch-wrapper {
    position: relative;
    top: auto;
    right: auto;
    margin-left: 1.5rem;
    z-index: 1001;
}

.theme-switch {
    display: inline-block;
    position: relative;
    width: 48px;
    height: 26px;
    margin-bottom: 0;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-switch .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #cbd5e1;
    transition: .4s;
    border-radius: 34px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6px;
}

.theme-switch .slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    z-index: 2;
    box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.theme-switch input:checked + .slider {
    background-color: #334155;
}

.theme-switch input:checked + .slider:before {
    transform: translateX(22px);
}

.theme-switch .slider .fa-sun {
    color: #eab308;
    font-size: 11px;
}

.theme-switch .slider .fa-moon {
    color: #f1f5f9;
    font-size: 11px;
}

/* About / Hero Section */
.profile-avatar-main {
    width: 220px;
    height: 220px;
    object-fit: cover;
    border: 6px solid var(--bg-card);
    box-shadow: var(--shadow-lg), 0 0 0 1px var(--border-color);
    transition: var(--transition);
}

.profile-avatar-main:hover {
    transform: scale(1.03) rotate(1deg);
    box-shadow: var(--shadow-lg), 0 0 20px var(--accent-glow);
}

.subheading {
    font-family: var(--font-sans) !important;
    text-transform: none !important;
    font-weight: 500 !important;
    font-size: 1.1rem !important;
    color: var(--text-muted) !important;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    align-items: center;
}

.subheading a {
    color: var(--primary);
    font-weight: 600;
}

.social-icons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.social-icons a {
    width: 42px;
    height: 42px;
    border-radius: 50% !important;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card) !important;
    color: var(--text-muted) !important;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: var(--transition);
}

.social-icons a:hover {
    background-color: var(--primary) !important;
    color: #ffffff !important;
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* Sections */
section.resume-section {
    padding: 6rem 1.5rem !important;
    border-bottom: 1px solid var(--border-color);
    max-width: 1000px;
    margin: 0 auto;
}

section.resume-section:last-of-type {
    border-bottom: none;
}

/* Timeline (Experience & Education) */
.timeline {
    position: relative;
    border-left: 2px solid var(--border-color);
    padding-left: 2rem;
    margin-left: 1rem;
    margin-top: 2rem;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: calc(-2rem - 7px);
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--primary);
    border: 2px solid var(--bg-body);
    box-shadow: 0 0 0 4px var(--accent-glow);
    transition: var(--transition);
}

.timeline-item:hover .timeline-dot {
    background-color: var(--text-main);
    transform: scale(1.2);
}

.timeline-date {
    display: none;
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-main);
}

.timeline-subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

/* Cards (Projects & Packages & Certs) */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.project-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px var(--accent-glow);
    border-color: var(--primary);
}

.project-card-img {
    height: 180px;
    width: 100%;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition) !important;
}

.project-card:hover .project-card-img {
    transform: scale(1.04);
}

.project-card-body {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.project-card-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

.project-card-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.tech-badge {
    background-color: var(--primary-light);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.project-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
}

/* Packages and Certifications styling */
.packages-grid, .certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.npm-card, .cert-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: var(--transition);
}

.npm-card:hover, .cert-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary);
}

.npm-card-icon, .cert-card-icon {
    font-size: 1.5rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    background-color: var(--bg-body);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}

.npm-card-content, .cert-card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.npm-card-footer, .cert-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    width: 100%;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.npm-card-footer a, .cert-card-footer a {
    white-space: nowrap;
}

.npm-card-title, .cert-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.15rem;
    color: var(--text-main);
}

.npm-card-subtitle, .cert-card-subtitle {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.npm-card-desc, .cert-card-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: var(--transition);
}

.stat-card-icon {
    width: 42px;
    height: 42px;
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-body);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border: 1px solid var(--border-color);
}

.stat-card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.stat-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.15rem;
    color: var(--text-main);
}

.stat-card-number {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.stat-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    width: 100%;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Research Paper Section */
.research-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    display: flex;
    gap: 1.5rem;
    transition: var(--transition);
    margin-top: 1rem;
}

.research-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.research-card-icon {
    font-size: 2.5rem;
    color: var(--primary);
    display: flex;
    align-items: center;
}

.research-card-content {
    flex: 1;
}

.research-card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.research-card-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.research-card-footer {
    font-size: 0.85rem;
}

/* Responsive Overrides */
@media (max-width: 991.98px) {
    #sideNav {
        height: 60px;
        padding: 0 1.25rem;
    }

    #sideNav .navbar-brand {
        font-size: 1.1rem;
    }

    #sideNav .navbar-collapse {
        background-color: var(--bg-card);
        border-bottom: 1px solid var(--border-color);
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        padding: 1.5rem;
        box-shadow: var(--shadow-lg);
        max-height: calc(100vh - 60px);
        overflow-y: auto;
    }

    #sideNav .navbar-nav {
        flex-direction: column !important;
        align-items: flex-start;
        gap: 1rem;
        margin-left: 0;
    }

    #sideNav .nav-link {
        width: 100%;
        padding: 0.5rem 0 !important;
    }

    #sideNav .nav-link::after {
        display: none;
    }

    .theme-switch-wrapper {
        margin-left: 0;
        margin-top: 1rem;
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .theme-switch-wrapper::before {
        content: 'Dark Mode';
        font-size: 0.875rem;
        font-weight: 600;
        color: var(--text-muted);
    }

    body {
        padding-top: 60px;
    }

    h1 {
        font-size: 2.5rem;
    }

    section.resume-section {
        padding: 4rem 1.25rem !important;
    }

    .profile-avatar-main {
        width: 160px;
        height: 160px;
    }
}

/* Scroll Progress Bar */
.scroll-progress-bar {
    position: fixed;
    top: 72px;
    left: 0;
    width: 0%;
    height: 3px;
    background-color: var(--primary);
    z-index: 1002;
    transition: width 0.1s ease-out;
}

@media (max-width: 991.98px) {
    .scroll-progress-bar {
        top: 60px;
    }
}

/* Scroll-Triggered Reveal Animations */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Skeleton Loading Pulse placeholders */
.skeleton-pulse {
    display: inline-block;
    height: 1.75rem;
    width: 100px;
    background-color: var(--border-color);
    border-radius: var(--border-radius-sm);
    position: relative;
    overflow: hidden;
    vertical-align: middle;
}

.skeleton-pulse::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
    background-image: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.15) 20%,
        rgba(255, 255, 255, 0.3) 60%,
        rgba(255, 255, 255, 0) 100%
    );
    animation: shimmer 1.5s infinite;
}

.theme-dark .skeleton-pulse::after {
    background-image: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.05) 20%,
        rgba(255, 255, 255, 0.1) 60%,
        rgba(255, 255, 255, 0) 100%
    );
}

@keyframes shimmer {
    100% {
        transform: translateX(100%);
    }
}

/* Copy email button */
.copy-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    margin-left: 0.25rem;
    padding: 0.25rem;
    font-size: 0.875rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    vertical-align: middle;
}

.copy-btn:hover {
    color: var(--primary);
    transform: scale(1.1);
}

.copy-btn:focus {
    outline: none;
}

/* Card hover glow enhancements */
.npm-card:hover, .cert-card:hover, .stat-card:hover, .research-card:hover {
    box-shadow: 0 8px 16px var(--accent-glow) !important;
}