:root {
    --bg-primary: #f4f6f9;
    --bg-card: #ffffff;
    --text-main: #2b2d42;
    --text-muted: #6c757d;
    --accent-color: #0056b3;
    --accent-light: #e8f0fe;
    --border-color: #d8dee4;
}

body.dark-mode {
    --bg-primary: #0f111a;
    --bg-card: #161b22;
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --accent-color: #58a6ff;
    --accent-light: #1f293d;
    --border-color: #30363d;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    line-height: 1.6;
    padding: 30px 15px;
    transition: background-color 0.3s, color 0.3s;
}

.cv-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}

.subtitle {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-top: 5px;
}

.contact-info {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 12px 0;
}

.cv-container {
    max-width: 950px;
    margin: 0 auto;
    background: var(--bg-card);
    padding: 35px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.04);
}

.cv-section {
    margin-bottom: 35px;
}

h2 {
    font-size: 1.35rem;
    border-left: 4px solid var(--accent-color);
    padding-left: 12px;
    margin-bottom: 20px;
}

.instruction-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    font-style: italic;
}

.tab-buttons, .filter-buttons, .action-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.btn, .tab-btn, .filter-btn, .ref-btn {
    background: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.tab-btn.active, .filter-btn.active {
    background: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
}

.ref-btn {
    background: var(--accent-light);
    color: var(--text-main);
    border-color: transparent;
}

.ref-btn:hover {
    filter: brightness(0.92);
}

.tab-display-box {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    min-height: 120px;
}

.tab-display-box h3 {
    margin-bottom: 8px;
    color: var(--text-main);
}

.inline-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px dashed var(--accent-color);
}

.inline-link:hover {
    text-decoration: none;
    border-bottom-style: solid;
}

.reference-box {
    margin-top: 15px;
    padding: 20px;
    background: var(--bg-primary);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.reference-box ul {
    padding-left: 20px;
}

.reference-box li {
    margin-bottom: 12px;
}

.hidden {
    display: none !important;
}

.skills-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 10px;
    list-style: none;
}

.skills-list li {
    background: var(--bg-primary);
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.ref-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 15px;
}

.block-btn {
    width: 100%;
    text-align: left;
    padding: 12px;
}
/* Interactive Experience Dashboard Configuration */
.experience-controls-grid {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    margin-top: 15px;
}

.exp-btn {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background: var(--bg-card, #ffffff);
    color: var(--text-main, #2b2d42);
    border: 1px solid var(--border-color, #d8dee4);
    padding: 12px 18px;
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    min-width: 160px;
    flex: 1 1 calc(20% - 12px);
    transition: all 0.2s ease-in-out;
}

.exp-btn .btn-title {
    font-weight: 600;
    font-size: 0.95rem;
    display: block;
}

.exp-btn .btn-sub {
    font-size: 0.8rem;
    color: var(--text-muted, #6c757d);
    margin-top: 4px;
    display: block;
}

/* Active Highlight Tracking States */
.exp-btn.active {
    background: var(--accent-color, #0056b3) !important;
    color: #ffffff !important;
    border-color: var(--accent-color, #0056b3) !important;
}

.exp-btn.active .btn-sub {
    color: rgba(255, 255, 255, 0.85) !important;
}

.experience-display-panel {
    background: var(--bg-primary, #f4f6f9);
    padding: 25px;
    border-radius: 8px;
    border-left: 5px solid var(--accent-color, #0056b3);
    margin-top: 15px;
    min-height: 140px;
}
/* Interactive Conferences Layout Configuration */
.conference-controls-grid {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    margin-top: 15px;
}

.conf-btn {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background: var(--bg-card, #ffffff);
    color: var(--text-main, #2b2d42);
    border: 1px solid var(--border-color, #d8dee4);
    padding: 12px 18px;
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    min-width: 160px;
    flex: 1 1 calc(33.33% - 12px);
    transition: all 0.2s ease-in-out;
}

.conf-btn .btn-title {
    font-weight: 600;
    font-size: 0.95rem;
    display: block;
}

.conf-btn .btn-sub {
    font-size: 0.8rem;
    color: var(--text-muted, #6c757d);
    margin-top: 4px;
    display: block;
}

/* Active Highlight Tracking States for Conferences */
.conf-btn.active {
    background: var(--accent-color, #0056b3) !important;
    color: #ffffff !important;
    border-color: var(--accent-color, #0056b3) !important;
}

.conf-btn.active .btn-sub {
    color: rgba(255, 255, 255, 0.85) !important;
}

.conference-display-panel {
    background: var(--bg-primary, #f4f6f9);
    padding: 25px;
    border-radius: 8px;
    border-left: 5px solid var(--accent-color, #0056b3);
    margin-top: 15px;
    min-height: 120px;
}
/* Educational Navigation Layout Styles */
.education-controls-grid {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    margin-top: 15px;
}

.edu-btn {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background: #ffffff !important;
    color: #2b2d42 !important;
    border: 1px solid #d8dee4 !important;
    padding: 12px 18px !important;
    border-radius: 8px !important;
    cursor: pointer !important;
    text-align: left !important;
    min-width: 160px;
    flex: 1 1 calc(25% - 12px);
    transition: all 0.2s ease-in-out;
}

.edu-btn .btn-title {
    font-weight: 600;
    font-size: 0.95rem;
}

.edu-btn .btn-sub {
    font-size: 0.8rem;
    color: #6c757d;
    margin-top: 4px;
}

/* Force Blue State Highlight on Selected Button Active Selection Click */
.edu-btn.active {
    background: #0056b3 !important;
    color: #ffffff !important;
    border-color: #0056b3 !important;
}

.edu-btn.active .btn-sub {
    color: rgba(255, 255, 255, 0.85) !important;
}

.education-display-panel {
    background: #f4f6f9;
    padding: 25px;
    border-radius: 8px;
    border-left: 5px solid #0056b3;
    margin-top: 15px;
    min-height: 120px;
}
/* Interactive Strengths Grid and Cards Layout */
.strengths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.strength-card {
    background: var(--bg-card, #ffffff);
    border: 1px solid var(--border-color, #d8dee4);
    padding: 18px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}

.strength-card h4 {
    color: var(--accent-color, #0056b3);
    font-size: 1rem;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border-color, #d8dee4);
    padding-bottom: 6px;
}

.strength-card ul {
    list-style-type: square;
    padding-left: 18px;
}

.strength-card li {
    font-size: 0.88rem;
    line-height: 1.5;
    margin-bottom: 8px;
    color: var(--text-main, #2b2d42);
}

.text-left-btn {
    display: inline-flex;
    align-items: center;
    font-weight: 600;
    padding: 10px 20px;
}

/* Interactive Languages Portfolio Layout styling */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.lang-card {
    background: var(--bg-card, #ffffff);
    border: 1px solid var(--border-color, #d8dee4);
    padding: 16px;
    border-radius: 8px;
}

.lang-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.lang-header h4 {
    font-size: 1.05rem;
    color: var(--text-main, #2b2d42);
}

.lang-scope {
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--accent-light, #e8f0fe);
    color: var(--accent-color, #0056b3);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Linguistic Progress Meters */
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border-color, #d8dee4);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: var(--accent-color, #0056b3);
    border-radius: 3px;
}

.lang-desc {
    font-size: 0.82rem;
    line-height: 1.4;
    color: var(--text-muted, #6c757d);
}
/* Skill Upgradation Responsive Timeline Grid */
.upgrade-activity-list {
    list-style-type: none;
    padding: 0;
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.upgrade-activity-list li {
    background: var(--bg-primary, #f4f6f9);
    border: 1px solid var(--border-color, #d8dee4);
    padding: 14px 18px;
    border-radius: 8px;
    display: flex;
    align-items: flex-start;
    gap: 15px;
    transition: all 0.25s ease;
    animation: fadeIn 0.3s ease-in-out;
}

.upgrade-activity-list li:hover {
    border-color: var(--accent-color, #0056b3);
    transform: translateX(4px);
}

.activity-date {
    background: var(--accent-color, #0056b3);
    color: #ffffff;
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 4px;
    white-space: nowrap;
    min-width: 100px;
    text-align: center;
}

/* Specific Style Overrides for Filter Controls */
.upgrade-filter-btn {
    background: var(--bg-card, #ffffff);
    color: var(--text-main, #2b2d42);
    border: 1px solid var(--border-color, #d8dee4);
    padding: 8px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.upgrade-filter-btn.active {
    background: var(--accent-color, #0056b3) !important;
    color: #ffffff !important;
    border-color: var(--accent-color, #0056b3) !important;
}
.hidden {
    display: none !important;
}

.education-display-panel {
    background: var(--bg-primary, #f4f6f9);
    padding: 25px;
    border-radius: 8px;
    border-left: 5px solid var(--accent-color, #0056b3);
    margin-top: 15px;
    min-height: 120px;
}
/* Custom Research and Personal Grid Styling */
.cv-section {
    margin: 2.5rem 0;
    padding: 1.5rem;
    border-radius: 8px;
    background: var(--card-bg, #ffffff);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.project-card {
    border-left: 4px solid #0076d6;
    padding-left: 1rem;
    margin-bottom: 1.25rem;
}

.personal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

/* Platform Engine Button Modules */
.platform-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.platform-btn {
    padding: 0.6rem 1.2rem;
    background-color: #f0f4f8;
    color: #1a202c;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    font-weight: 500;
}

.platform-btn:hover {
    background-color: #0076d6;
    color: #ffffff;
    border-color: #0076d6;
    transform: translateY(-2px);
}

.hidden-panel-node {
    padding: 1rem;
    background-color: #f8fafc;
    border: 1px dashed #94a3b8;
    border-radius: 6px;
    margin-top: 1rem;
    display: none;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Job Roles Styling */
.roles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.role-tag {
    background-color: var(--card-sub-bg, #f8fafc);
    padding: 1rem;
    border-radius: 6px;
    border-left: 3px solid #10b981;
    font-size: 0.95rem;
    line-height: 1.4;
}

/* Reference Directory Layout */
.references-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-top: 1.25rem;
}

.reference-card {
    border: 1px solid var(--border-color, #e2e8f0);
    padding: 1.25rem;
    border-radius: 8px;
    background-color: var(--card-bg, #ffffff);
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.reference-card h4 {
    margin: 0 0 0.5rem 0;
    color: #0076d6;
    font-size: 1.1rem;
}

.reference-card p {
    margin: 0.25rem 0;
    font-size: 0.9rem;
}

.ref-inst {
    color: #64748b;
    font-style: italic;
}

.ref-contact {
    font-weight: 600;
    margin-top: 0.5rem !important;
}

/* Technical Areas Tag Cloud layout */
.interest-tag-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.interest-chip {
    background: linear-gradient(135deg, #0076d6, #00539b);
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s ease;
}

.interest-chip:hover {
    transform: scale(1.05);
}

/* Formal Verification Sign-off Box */
.declaration-panel {
    margin: 4rem 0 2rem 0;
    text-align: center;
}

.declaration-divider {
    border: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, #cbd5e1, transparent);
    margin-bottom: 2rem;
}

.declaration-text {
    color: #64748b;
    font-size: 0.95rem;
}

.signature-space {
    margin-top: 2rem;
    display: inline-block;
    border-top: 1px dashed #94a3b8;
    padding-top: 0.5rem;
    min-width: 250px;
}

.sig-name {
    font-weight: 700;
    color: #1a202c;
    margin: 0;
}

.sig-title {
    font-size: 0.85rem;
    color: #64748b;
    margin: 0;
}