/* -------------------------------------------------------------
 * PREMIUM PORTFOLIO DESIGN SYSTEM & STYLESHEET
 * Author: Antigravity for Chidambaram Muthappan
 * ------------------------------------------------------------- */

/* Theme Variables (HSL System for Maximum Harmony) */
:root[data-theme="dark"] {
    --bg: #050508; /* Deep Obsidian Black */
    --bg-glow-1: rgba(99, 102, 241, 0.12); /* Indigo glow */
    --bg-glow-2: rgba(20, 184, 166, 0.12); /* Teal glow */
    --panel: rgba(13, 13, 20, 0.65); /* Glassmorphism background */
    --panel-hover: rgba(20, 20, 30, 0.8);
    --panel-border: rgba(255, 255, 255, 0.06);
    --panel-border-hover: rgba(99, 102, 241, 0.3);
    --text: #f3f4f6; /* Off white */
    --text-muted: #9ca3af; /* Gray */
    --primary: #818cf8; /* Vibrant Indigo */
    --primary-rgb: 129, 140, 248;
    --accent: #2dd4bf; /* Neon Teal */
    --accent-rgb: 45, 212, 191;
    --nav-bg: rgba(5, 5, 8, 0.8);
    --shadow: rgba(0, 0, 0, 0.4);
    --btn-text: #050508;
    --dot-color: #818cf8;
}

:root[data-theme="light"] {
    --bg: #f8fafc; /* Crisp Slate Alabaster */
    --bg-glow-1: rgba(99, 102, 241, 0.06);
    --bg-glow-2: rgba(20, 184, 166, 0.06);
    --panel: rgba(255, 255, 255, 0.75); /* Soft light glass */
    --panel-hover: rgba(255, 255, 255, 0.9);
    --panel-border: rgba(0, 0, 0, 0.08);
    --panel-border-hover: rgba(99, 102, 241, 0.4);
    --text: #0f172a; /* Slate Dark */
    --text-muted: #64748b; /* Slate Gray */
    --primary: #4f46e5; /* Deep Indigo */
    --primary-rgb: 79, 70, 229;
    --accent: #0d9488; /* Dark Teal */
    --accent-rgb: 13, 148, 136;
    --nav-bg: rgba(248, 250, 252, 0.85);
    --shadow: rgba(15, 23, 42, 0.08);
    --btn-text: #ffffff;
    --dot-color: #4f46e5;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background-color 0.4s ease, color 0.4s ease;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Typography Details */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all 0.3s ease;
}

/* Glow Background Circles */
.bg-glow {
    position: fixed;
    width: 50vw;
    height: 50vw;
    border-radius: 50%;
    filter: blur(140px);
    z-index: -1;
    pointer-events: none;
    transition: background 0.5s ease;
}

.bg-glow-1 {
    top: -20%;
    left: -10%;
    background: var(--bg-glow-1);
}

.bg-glow-2 {
    bottom: -20%;
    right: -10%;
    background: var(--bg-glow-2);
}

/* Glassmorphism Panel Helper Utility */
.glass-panel {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 1.25rem;
    box-shadow: 0 8px 32px 0 var(--shadow);
    transition: border 0.3s ease, background 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
}

/* Interactive Card Hover-lift Utility */
.card-lift:hover {
    transform: translateY(-5px);
    border-color: var(--panel-border-hover);
    box-shadow: 0 12px 40px 0 rgba(var(--primary-rgb), 0.12);
}

/* Container Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.text-center { text-align: center; }
.text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.w-full { width: 100%; }

/* Buttons System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 0.75rem;
    cursor: pointer;
    font-family: 'Outfit', sans-serif;
    border: 1px solid transparent;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    border-radius: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--btn-text);
    box-shadow: 0 4px 20px rgba(var(--primary-rgb), 0.25);
}

.btn-primary:hover {
    transform: scale(1.03);
    box-shadow: 0 6px 24px rgba(var(--primary-rgb), 0.4);
}

.btn-primary-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-primary-outline:hover {
    background: rgba(var(--primary-rgb), 0.08);
    border-color: var(--accent);
    color: var(--accent);
    transform: scale(1.02);
}

/* ------------------ NAVBAR STYLES ------------------ */
.navbar {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 1200px;
    height: 4rem;
    z-index: 1000;
    border-radius: 1rem;
    background: var(--nav-bg);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 1.5rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 800;
    font-size: 1.5rem;
    font-family: 'Outfit', sans-serif;
    color: var(--text);
}

.logo-dot {
    width: 0.75rem;
    height: 0.75rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-weight: 500;
    color: var(--text-muted);
    font-family: 'Outfit', sans-serif;
    padding: 0.25rem 0.5rem;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    transition: width 0.3s ease;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--panel-border);
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text);
    transition: all 0.3s ease;
}

.theme-toggle-btn:hover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.08);
}

.theme-toggle-btn svg {
    width: 1.25rem;
    height: 1.25rem;
    position: absolute;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-theme="dark"] .icon-sun { opacity: 0; transform: rotate(90deg) scale(0.6); }
[data-theme="dark"] .icon-moon { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.6); }

/* ------------------ LAYOUT DESIGN ------------------ */
.main-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    padding-top: 7rem;
    padding-bottom: 3rem;
}

/* Sticky Profile Aside Card */
.profile-aside {
    position: sticky;
    top: 7rem;
    height: calc(100vh - 9rem);
    z-index: 10;
}

.profile-card {
    height: 100%;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* Profile Avatar */
.profile-avatar-container {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 1.5rem;
}

.profile-avatar-single {
    width: 100%;
    height: 100%;
    position: relative;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--primary);
    box-shadow: 0 0 20px rgba(var(--primary-rgb), 0.25);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.profile-avatar-single:hover {
    transform: scale(1.05);
    border-color: var(--accent);
    box-shadow: 0 0 25px rgba(var(--accent-rgb), 0.35);
}

.profile-avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.profile-name {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.profile-title {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.profile-location {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    font-size: 0.875rem;
    color: var(--accent);
    font-weight: 500;
}

.profile-quick-details {
    border-top: 1px solid var(--panel-border);
    border-bottom: 1px solid var(--panel-border);
    padding: 1rem 0;
    margin: 1rem 0;
    text-align: left;
}

.detail-item {
    margin-bottom: 0.75rem;
}
.detail-item:last-child { margin-bottom: 0; }

.detail-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.15rem;
}

.detail-value {
    font-size: 0.875rem;
    font-weight: 500;
    word-break: break-all;
}

.profile-socials {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 0.5rem;
}

.social-btn {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.2);
}

.aside-footer {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 1rem;
}

/* ------------------ MAIN SECTION FLOW ------------------ */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.section-panel {
    padding: 2.5rem;
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.75rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 3.5rem;
    height: 4px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 2px;
}

/* About Grid */
.about-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.lead-bio {
    font-size: 1.2rem;
    font-weight: 500;
    line-height: 1.6;
    color: var(--text);
    border-left: 4px solid var(--accent);
    padding-left: 1.25rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.bio-paragraph {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.personal-highlights-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.highlight-badge {
    padding: 1rem;
    text-align: center;
    border-radius: 0.75rem;
}

.badge-num {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    color: var(--primary);
}

.badge-txt {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
}

/* ------------------ TIMELINE STYLES ------------------ */
.timeline {
    position: relative;
    padding-left: 2rem;
    margin-top: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 0.5rem;
    bottom: 0.5rem;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

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

.timeline-dot {
    position: absolute;
    left: -2rem;
    top: 1.5rem;
    transform: translateX(-40%);
    width: 14px;
    height: 14px;
    background: var(--bg);
    border: 3px solid var(--accent);
    border-radius: 50%;
    z-index: 2;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.timeline-item:hover .timeline-dot {
    background: var(--accent);
    box-shadow: 0 0 10px var(--accent);
}

.timeline-content {
    padding: 1.75rem;
}

.timeline-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.role-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.company-name {
    font-size: 1rem;
    font-weight: 600;
}

.duration-badge {
    padding: 0.35rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--primary);
    border: 1px solid rgba(var(--primary-rgb), 0.15);
}

.achievement-list {
    list-style: none;
}

.achievement-list li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9375rem;
}

.achievement-list li:last-child { margin-bottom: 0; }

.achievement-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* ------------------ SKILLS & CREDENTIALS ------------------ */
.skills-layout-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.skills-card {
    padding: 1.75rem;
}

.card-subtitle {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tag {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--panel-border);
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.skill-tag:hover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.08);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.1);
}

.tag-pct {
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: bold;
}

/* Education Details */
.education-block {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.edu-item {
    border-left: 2px solid var(--panel-border);
    padding-left: 1rem;
}

.edu-item h4 {
    font-size: 1.1rem;
}

.school-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--primary);
}

.edu-details {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.edu-notes {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Credentials and Awards */
.credentials-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.cred-item {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.cred-item h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.15rem;
}

.cred-authority {
    font-size: 0.75rem;
    color: var(--accent);
    text-transform: uppercase;
    font-weight: 700;
}

.cred-link {
    align-self: flex-start;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--primary);
}

.cred-link:hover {
    color: var(--accent);
}

/* ------------------ KEYCHAIN GALLERY ------------------ */
.section-intro {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-muted);
    border-left: 3px solid var(--primary);
    padding-left: 1rem;
    margin-bottom: 1.5rem;
}

.gallery-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--panel-border);
    color: var(--text-muted);
    padding: 0.5rem 1.25rem;
    border-radius: 2rem;
    cursor: pointer;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--text);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-color: transparent;
    color: var(--btn-text);
    box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.2);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.25rem;
}

.gallery-card {
    overflow: hidden;
    cursor: pointer;
}

.gallery-card.hidden {
    display: none;
}

.img-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.2);
}

.keychain-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.gallery-card:hover .keychain-img {
    transform: scale(1.08);
}

.card-info {
    padding: 1rem;
}

.keychain-title {
    font-size: 0.9375rem;
    margin-bottom: 0.15rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.keychain-loc {
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: 600;
}

/* ------------------ CONTACT FORM ------------------ */
.contact-grid {
    display: grid;
    grid-template-columns: 1.1fr 1.3fr;
    gap: 1.5rem;
}

.contact-details-block {
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.contact-intro {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.contact-bullets {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.contact-bullets li {
    display: flex;
    align-items: flex-start;
    gap: 0.875rem;
}

.bullet-icon {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    background: rgba(var(--primary-rgb), 0.08);
    border: 1px solid rgba(var(--primary-rgb), 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.bullet-text strong {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.bullet-text span, .bullet-text a {
    font-size: 0.875rem;
    font-weight: 500;
}

.contact-form-block {
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.form-group input, .form-group textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--panel-border);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--text);
    font-family: inherit;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 10px rgba(var(--primary-rgb), 0.15);
}

/* ------------------ LIGHTBOX MODAL ------------------ */
.lightbox-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 5, 8, 0.95);
    backdrop-filter: blur(12px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox-overlay.active {
    display: flex;
    opacity: 1;
}

.lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 2.5rem;
    cursor: pointer;
    transition: color 0.3s ease;
}

.lightbox-close:hover {
    color: var(--accent);
}

.lightbox-content {
    max-width: 90%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 70vh;
    border-radius: 0.75rem;
    border: 1px solid var(--panel-border);
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    object-fit: contain;
}

.lightbox-caption {
    margin-top: 1rem;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    text-align: center;
}

/* ------------------ ANIMATIONS ------------------ */
/* Scroll reveal effect */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ------------------ RESPONSIVE BREAKPOINTS ------------------ */
@media (max-width: 992px) {
    .main-layout {
        grid-template-columns: 1fr;
        padding-top: 6.5rem;
    }
    
    .profile-aside {
        position: relative;
        top: 0;
        height: auto;
    }
    
    .profile-card {
        padding: 2.5rem;
    }
}

@media (max-width: 768px) {
    .navbar {
        top: 0.5rem;
        width: 95%;
    }
    
    .nav-menu {
        display: none; /* Mobile menu hidden or accessible, we keep it simple */
    }
    
    .section-panel {
        padding: 1.5rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .personal-highlights-row {
        grid-template-columns: 1fr;
    }
}

/* ------------------ EMAIL COPY INTERACTION ------------------ */
.email-copy-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
}

.copy-email-btn {
    background: transparent;
    border: 1px solid var(--panel-border);
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 0.35rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.3s ease;
    position: relative;
}

.copy-email-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(var(--accent-rgb), 0.08);
}

.copy-email-btn svg {
    pointer-events: none;
}

/* Tooltip container */
.copy-email-btn .tooltip-text {
    visibility: hidden;
    width: 60px;
    background-color: var(--text);
    color: var(--bg);
    text-align: center;
    border-radius: 4px;
    padding: 2px 0;
    position: absolute;
    z-index: 100;
    bottom: 125%; /* Position above the button */
    left: 50%;
    margin-left: -30px;
    opacity: 0;
    transition: opacity 0.3s, bottom 0.3s;
    font-size: 0.7rem;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.copy-email-btn:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
    bottom: 140%;
}

/* ------------------ CORE EXPERTISE STYLES ------------------ */
.core-expertise-card {
    grid-column: 1 / -1; /* Full width spanning */
    border: 1px solid rgba(var(--accent-rgb), 0.2);
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.06), rgba(var(--accent-rgb), 0.06));
}

.core-expertise-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(var(--accent-rgb), 0.1);
}

.expertise-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.expertise-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.expertise-icon {
    font-size: 1.25rem;
    background: rgba(var(--accent-rgb), 0.1);
    width: 2.5rem;
    height: 2.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
    flex-shrink: 0;
    border: 1px solid rgba(var(--accent-rgb), 0.15);
}

.expertise-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.expertise-desc {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.4;
}

@media (max-width: 768px) {
    .expertise-row {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
}

/* ------------------ COLLAPSIBLE TIMELINE STYLES ------------------ */
.timeline-header-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toggle-details-btn {
    background: transparent;
    border: 1px solid var(--panel-border);
    padding: 0.35rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Outfit', sans-serif;
    outline: none;
}

.toggle-details-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(var(--accent-rgb), 0.08);
}

.toggle-icon {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-muted);
}

.toggle-details-btn:hover .toggle-icon {
    color: var(--accent);
}

.toggle-details-btn.active .toggle-icon {
    transform: rotate(180deg);
}

/* Smooth Accordion Height Animation via CSS Grid template rows */
.collapsible-wrapper {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease, margin-top 0.3s ease;
    opacity: 0;
    overflow: hidden;
}

.collapsible-wrapper.expanded {
    grid-template-rows: 1fr;
    opacity: 1;
    margin-top: 1.25rem;
}

.collapsible-wrapper > .achievement-list {
    min-height: 0;
}