/* ==========================================================================
   DEVELOPER PORTFOLIO - CSS DESIGN SYSTEM (MIDNIGHT SLATE & COBALT BLUE)
   Theme: High-Contrast Technical Modernism
   Author: Anshul Prajapati
   ========================================================================== */

/* 1. System Variables */
:root {
    --bg-base: #11131b;
    --bg-surface: #191b23;
    --bg-surface-hover: #212431;
    
    --border-dim: rgba(255, 255, 255, 0.08);
    --border-med: rgba(255, 255, 255, 0.16);
    --border-bright: #2563eb;
    
    --text-primary: #e1e2ed;
    --text-secondary: #c3c6d7;
    --text-muted: #8d90a0;
    
    --accent-primary: #2563eb;
    --accent-secondary: #60a5fa;
    
    --font-heading: 'Sora', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 8px;
    
    --transition-fast: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-standard: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-base);
}

body {
    background-color: var(--bg-base);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background-color: var(--accent-primary);
    z-index: 102;
    transition: width 0.1s ease;
}

/* 3. Typography & Headings */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

.text-center { text-align: center; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

.section-label {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent-secondary);
    margin-bottom: 12px;
    background-color: rgba(96, 165, 250, 0.08);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.03em;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 56px auto;
}

/* 4. Common Panel Styles */
.glass-panel {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius-md);
    transition: var(--transition-standard);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 26px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid transparent;
    font-family: var(--font-heading);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #3b82f6;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--border-med);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.04);
    border-color: var(--text-primary);
    transform: translateY(-1px);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* 5. Sticky Navigation Header */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    z-index: 100;
    background-color: rgba(17, 19, 27, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-dim);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 24px;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    color: var(--text-primary);
}

.logo-dot {
    color: var(--accent-primary);
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 6px 0;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: var(--transition-fast);
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
    padding: 4px;
}

.menu-toggle .bar {
    width: 20px;
    height: 1.5px;
    background-color: var(--text-primary);
    transition: var(--transition-fast);
}

/* 6. Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0 80px 0;
    width: 100%;
}

.hero-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 64px;
    align-items: center;
    width: 100%;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.badge-container {
    margin-bottom: 16px;
}

.status-badge {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    background-color: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.2);
    color: var(--accent-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    letter-spacing: 0.04em;
}

.hero-title {
    font-size: 3.8rem;
    line-height: 1.1;
    margin-bottom: 24px;
    font-weight: 700;
    letter-spacing: -0.04em;
    color: var(--text-primary);
}

.hero-title span {
    color: var(--accent-primary);
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    line-height: 1.65;
    max-width: 600px;
}

.hero-ctas {
    display: flex;
    gap: 16px;
}

/* Hero Terminal Visual */
.hero-visual {
    display: flex;
    justify-content: flex-end;
}

.terminal-mock {
    width: 100%;
    max-width: 440px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius-md);
    padding: 20px;
    font-family: var(--font-mono);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.term-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--border-med);
}

.term-file {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: 8px;
}

.term-code {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
    overflow-x: auto;
}

/* 7. About Section */
.about-section {
    padding: 100px 0;
    border-top: 1px solid var(--border-dim);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
}

.about-left .paragraph {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.skills-block {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.skills-category-title {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-dim);
    padding-bottom: 12px;
}

.skills-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.skill-item h3 {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

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

/* 8. Institutional Affiliations Section */
.institutes-section {
    padding: 100px 0;
    border-top: 1px solid var(--border-dim);
}

.inst-list {
    display: flex;
    flex-direction: column;
    margin-top: 24px;
}

.inst-row {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr 1fr;
    padding: 24px 16px;
    border-bottom: 1px solid var(--border-dim);
    align-items: center;
    transition: var(--transition-fast);
}

.inst-row:hover {
    background-color: rgba(255, 255, 255, 0.015);
}

.inst-acronym {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.inst-project-name {
    font-size: 0.98rem;
    color: var(--text-secondary);
}

.inst-type {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: right;
    font-family: var(--font-mono);
    text-transform: uppercase;
}

/* 9. Technical Projects Section */
.projects-section {
    padding: 100px 0;
    border-top: 1px solid var(--border-dim);
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    background-color: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-heading);
}

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

.filter-btn.active {
    background-color: rgba(255, 255, 255, 0.04);
    border-color: var(--border-med);
    color: var(--text-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 28px;
}

.project-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 32px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.project-card:hover {
    border-color: var(--accent-primary);
    background-color: var(--bg-surface-hover);
}

.project-tag-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.project-tag {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-dim);
    color: var(--text-secondary);
}

.project-info-body {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-card-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
}

.project-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-meta-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
}

.project-org {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
}

.read-more {
    font-size: 0.85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--text-primary);
}

/* 10. Contact Section */
.contact-section {
    padding: 100px 0;
    border-top: 1px solid var(--border-dim);
}

.contact-grid {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 64px;
}

.contact-text {
    font-size: 1.05rem;
    margin-bottom: 36px;
    line-height: 1.7;
}

.social-channels {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.social-link {
    display: flex;
    flex-direction: column;
    padding: 16px;
}

.social-link:hover {
    border-color: var(--accent-primary);
    background-color: var(--bg-surface-hover);
}

.link-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

.link-val {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 4px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input, .form-group textarea {
    background-color: #070a12;
    border: 1px solid var(--border-dim);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.92rem;
    transition: var(--transition-fast);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background-color: var(--bg-surface-hover);
}

.form-status {
    font-size: 0.9rem;
    font-weight: 700;
    text-align: center;
}

.form-status.success { color: var(--text-primary); }
.form-status.error { color: #f87171; }

/* 11. Modal System */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.modal.active {
    opacity: 1;
    pointer-events: all;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(3, 4, 9, 0.85);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 720px;
    max-height: 80vh;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-med);
    border-radius: var(--radius-md);
    z-index: 1001;
    overflow-y: auto;
    transform: scale(0.96);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 24px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    z-index: 3;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 40px;
}

.modal-proj-org {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
}

.modal-proj-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.25;
}

.modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 28px;
}

.modal-section-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 32px 0 16px 0;
    border-bottom: 1px solid var(--border-dim);
    padding-bottom: 8px;
}

.modal-body p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 18px;
    line-height: 1.7;
}

.modal-list {
    margin-left: 20px;
    margin-bottom: 30px;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.modal-list li {
    margin-bottom: 10px;
    line-height: 1.6;
}

.modal-code-block {
    margin-top: 18px;
    background-color: #070a12;
    border: 1px solid var(--border-dim);
    border-radius: var(--radius-md);
    padding: 20px;
    position: relative;
}

.copy-code-btn {
    position: absolute;
    top: 14px;
    right: 14px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-dim);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-md);
    font-size: 0.72rem;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.copy-code-btn:hover {
    border-color: var(--border-med);
    color: var(--text-primary);
}

/* 12. Footer */
.footer {
    border-top: 1px solid var(--border-dim);
    padding: 40px 0;
}

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

.footer-copy {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.footer-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 13. Responsive Media Queries */
@media (max-width: 1024px) {
    .hero-wrapper {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 48px;
    }
    
    .hero-content {
        align-items: center;
    }
    
    .hero-desc {
        max-width: 100%;
    }
    
    .hero-visual {
        display: none;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 768px) {
    .navbar {
        height: 72px;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 72px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 72px);
        background-color: var(--bg-base);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 36px;
        transition: var(--transition-standard);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .inst-row {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    
    .inst-type {
        grid-column: span 2;
        text-align: left;
        margin-top: 4px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}