/* Advanced Portfolio Stylesheet - Edidi Sai Anant - Mobile Enhanced */

:root {
    /* Color Palette */
    --color-bg: #0a0e1a;
    --color-bg-light: #1a1f35;
    --color-bg-card: #161b2e;
    --color-text-primary: #e6f1ff;
    --color-text-secondary: #8892b0;
    --color-text-highlight: #ccd6f6;
    --color-accent-copper: #d38a5c;
    --color-accent-cyan: #64ffda;
    --color-accent-gold: #ffd700;
    
    /* Typography */
    --font-primary: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Roboto Mono', 'SF Mono', Monaco, monospace;
    
    /* Layout */
    --header-height: 70px;
    --transition-smooth: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    --border-radius: 12px;
    --box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
    --box-shadow-hover: 0 20px 30px -15px rgba(2, 12, 27, 0.8);
}

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

html {
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
    -webkit-overflow-scrolling: touch;
}

body {
    background: linear-gradient(135deg, var(--color-bg) 0%, #0d1421 50%, var(--color-bg) 100%);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Custom Accent Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-light);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-accent-copper), var(--color-accent-cyan));
    border-radius: 10px;
    border: 2px solid var(--color-bg-light);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--color-accent-gold), var(--color-accent-copper));
    transform: scale(1.1);
}

/* Firefox Scrollbar */
html {
    scrollbar-width: thin;
    scrollbar-color: var(--color-accent-copper) var(--color-bg-light);
}

/* Loader - Centered */
.loader {
    position: fixed;
    top: 0; 
    left: 0;
    width: 100vw; 
    height: 100vh;
    background: var(--color-bg);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease-out, visibility 0s 0.5s;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.processor-grid {
    display: grid;
    grid-template-columns: repeat(3, 25px);
    grid-template-rows: repeat(3, 25px);
    gap: 8px;
    margin-bottom: 2rem;
}

.processor-grid div {
    width: 25px;
    height: 25px;
    background: var(--color-bg-light);
    border-radius: 4px;
    animation: pulse 2s infinite ease-in-out;
}

.processor-grid .core {
    background: var(--color-accent-copper);
}

.processor-grid .central {
    background: var(--color-accent-cyan);
    animation-delay: 0.5s;
}

.loader-text {
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

@keyframes pulse {
    0%, 100% { transform: scale(0.8); opacity: 0.6; }
    50% { transform: scale(1.2); opacity: 1; }
}

.processor-grid div:nth-child(2) { animation-delay: 0.2s; }
.processor-grid div:nth-child(3) { animation-delay: 0.4s; }
.processor-grid div:nth-child(4) { animation-delay: 0.6s; }
.processor-grid div:nth-child(6) { animation-delay: 0.8s; }
.processor-grid div:nth-child(7) { animation-delay: 1s; }
.processor-grid div:nth-child(8) { animation-delay: 1.2s; }
.processor-grid div:nth-child(9) { animation-delay: 1.4s; }

/* Interactive Background */
#interactive-bg {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: -1;
}

/* Fixed Clean Header */
.main-header {
    position: fixed;
    top: 0; 
    left: 0;
    width: 100%; 
    height: var(--header-height);
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
    z-index: 100;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    font-family: var(--font-mono);
    align-items: center;
    justify-content: center;
    width: 100%;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    border-radius: 6px;
    transition: var(--transition-smooth);
    position: relative;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-accent-copper);
    background: rgba(211, 138, 92, 0.1);
    border-bottom-color: var(--color-accent-copper);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 101;
    position: absolute;
    right: 1rem;
    justify-content: space-around;
    width: 30px;
    height: 30px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-accent-copper);
    margin: 3px 0;
    transition: var(--transition-smooth);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Main Container */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Sections */
.section {
    min-height: 100vh;
    padding: var(--header-height) 0 2rem;
    display: flex;
    align-items: center;
    scroll-snap-align: start;
    opacity: 0;
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    transform: translateY(30px);
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    color: var(--color-text-primary);
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    font-weight: 700;
    position: relative;
}

.section-title::after {
    content: "";
    flex-grow: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--color-accent-copper), transparent);
    margin-left: 2rem;
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--color-accent-copper);
    background: var(--color-accent-copper);
    color: var(--color-bg);
    font-family: var(--font-mono);
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition-bounce);
    font-size: 0.9rem;
    box-shadow: var(--box-shadow);
    min-height: 44px;
}

.button:hover {
    background: transparent;
    color: var(--color-accent-copper);
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-hover);
}

.button-outline {
    background: transparent;
    color: var(--color-accent-copper);
}

.button-outline:hover {
    background: var(--color-accent-copper);
    color: var(--color-bg);
}

/* Hero Section */
.hero-section {
    background: radial-gradient(ellipse at center, rgba(100, 255, 218, 0.05) 0%, transparent 70%);
}

.hero-intro {
    color: var(--color-accent-copper);
    font-family: var(--font-mono);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(2rem, 7vw, 4rem);
    font-weight: 700;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
}

.hero-description {
    max-width: 600px;
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 3rem;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* About Section */
.about-content p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    max-width: 700px;
    font-size: 1.05rem;
    line-height: 1.7;
}

/* Experience Section */
.experience-tabs {
    display: flex;
    gap: 3rem;
    min-height: 400px;
}

.tab-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    border-left: 2px solid var(--color-bg-light);
}

.tab-button {
    background: transparent;
    border: none;
    border-left: 2px solid transparent;
    color: var(--color-text-secondary);
    padding: 1rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-smooth);
    white-space: nowrap;
    position: relative;
    margin-left: -2px;
    min-height: 44px;
}

.tab-button:hover {
    background: rgba(100, 255, 218, 0.05);
    color: var(--color-accent-cyan);
}

.tab-button.active {
    color: var(--color-accent-copper);
    border-left-color: var(--color-accent-copper);
    background: rgba(211, 138, 92, 0.1);
}

.tab-content {
    flex: 1;
    min-height: 400px;
}

.tab-panel {
    display: none;
    animation: fadeInUp 0.5s ease-out;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.panel-company {
    color: var(--color-accent-copper);
    font-weight: 600;
}

.panel-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin: 0.5rem 0;
}

.panel-location {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent-cyan);
    margin-bottom: 1.5rem;
}

.tab-panel ul {
    list-style: none;
}

.tab-panel li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.75rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.tab-panel li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--color-accent-copper);
    font-weight: bold;
}

/* Enhanced Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    padding: 1rem 0;
}

.flip-card {
    background: transparent;
    height: 300px;
    perspective: 1000px;
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: transform 0.3s ease;
}

.flip-card:hover {
    transform: translateY(-5px);
}

.flip-card:focus {
    outline: 2px solid var(--color-accent-copper);
    outline-offset: 4px;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
}

.flip-card:hover .card-inner,
.flip-card.mobile-flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    background: linear-gradient(135deg, var(--color-bg-card) 0%, rgba(26, 31, 53, 0.9) 100%);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--border-radius);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.card-back {
    transform: rotateY(180deg);
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2.5rem;
    background: linear-gradient(135deg, rgba(211, 138, 92, 0.1) 0%, var(--color-bg-card) 100%);
}

.card-front:hover,
.card-back:hover {
    border-color: var(--color-accent-copper);
    box-shadow: 0 12px 40px rgba(211, 138, 92, 0.2);
}

.card-front h4 {
    font-size: 1.4rem;
    color: var(--color-text-primary);
    font-weight: 600;
    margin-bottom: auto;
    line-height: 1.3;
}

.card-back p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 1.05rem;
}

/* Enhanced Tech Badges with Consistent Theme */
/* Minimalistic Copper Tech Badges */
.tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.tech-badge {
    background: linear-gradient(135deg, var(--color-accent-copper) 0%, #c67b47 100%);
    color: var(--color-bg);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid rgba(211, 138, 92, 0.4);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(211, 138, 92, 0.3);
}

.tech-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.tech-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(211, 138, 92, 0.4);
    background: linear-gradient(135deg, #e09760 0%, var(--color-accent-copper) 100%);
}

.tech-badge:hover::before {
    left: 100%;
}


/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--color-bg-card);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(100, 255, 218, 0.1);
    box-shadow: var(--box-shadow);
    transition: var(--transition-smooth);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
    border-color: var(--color-accent-copper);
}

.skill-category h3 {
    color: var(--color-accent-copper);
    margin-bottom: 1.5rem;
    font-family: var(--font-mono);
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.skills-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1rem;
    background: rgba(100, 255, 218, 0.05);
    border-radius: var(--border-radius);
    transition: var(--transition-bounce);
    cursor: pointer;
    min-height: 80px;
}

.skill-item:hover {
    background: rgba(211, 138, 92, 0.1);
    transform: translateY(-3px);
}

.skill-item i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--color-accent-cyan);
}

.skill-item span {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* Custom Xilinx Logo */
.skill-item.xilinx-vivado i {
    background: url('assets/XLNX.png') center/contain no-repeat;
    color: transparent;
    width: 2rem;
    height: 2rem;
    filter: hue-rotate(10deg) saturate(0.8) brightness(0.9) contrast(1.1);
    font-size: 0;
}

.skill-item.xilinx-vitis i {
    background: url('assets/XLNX.png') center/contain no-repeat;
    color: transparent;
    width: 2rem;
    height: 2rem;
    filter: hue-rotate(10deg) saturate(0.8) brightness(0.9) contrast(1.1);
    font-size: 0;
}

/* Education Section */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.education-card {
    background: var(--color-bg-card);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(100, 255, 218, 0.1);
    box-shadow: var(--box-shadow);
    transition: var(--transition-smooth);
}

.education-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
    border-color: var(--color-accent-copper);
}

.education-card h3 {
    color: var(--color-text-primary);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.institution {
    color: var(--color-accent-copper);
    font-family: var(--font-mono);
    font-size: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.duration {
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.courses h4 {
    color: var(--color-accent-cyan);
    font-size: 1rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.courses ul {
    list-style: none;
}

.courses li {
    color: var(--color-text-secondary);
    padding-left: 1rem;
    position: relative;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.courses li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-accent-copper);
}

/* Certifications Section */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.cert-card {
    background: var(--color-bg-card);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(100, 255, 218, 0.1);
    box-shadow: var(--box-shadow);
    transition: var(--transition-smooth);
}

.cert-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-hover);
    border-color: var(--color-accent-copper);
}

.cert-provider {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.cert-provider i {
    color: var(--color-accent-cyan);
    font-size: 1.2rem;
}

.cert-provider span {
    color: var(--color-accent-copper);
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.9rem;
}

.cert-card h3 {
    color: var(--color-text-primary);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.cert-date {
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

.cert-id {
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    opacity: 0.8;
}

/* Publications Section */
.publications-content {
    display: grid;
    gap: 3rem;
}

.publications-block,
.patents-block {
    background: var(--color-bg-card);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(100, 255, 218, 0.1);
    box-shadow: var(--box-shadow);
}

.publications-block h3,
.patents-block h3 {
    color: var(--color-accent-copper);
    font-size: 1.5rem;
    margin-bottom: 2rem;
    font-weight: 600;
}

.publication-item,
.patent-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.publication-item:last-child,
.patent-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.publication-item h4,
.patent-item h4 {
    color: var(--color-text-primary);
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    line-height: 1.4;
}

.publication-details,
.patent-details {
    color: var(--color-accent-cyan);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.publication-description,
.patent-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-size: 1rem;
}

/* Contact Section */
.contact-section {
    text-align: center;
    background: radial-gradient(ellipse at center, rgba(211, 138, 92, 0.05) 0%, transparent 70%);
}

.contact-lead {
    font-family: var(--font-mono);
    color: var(--color-accent-copper);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.contact-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 2rem;
    color: var(--color-text-primary);
    font-weight: 700;
}

.contact-description {
    max-width: 600px;
    margin: 0 auto 3rem;
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
}

.contact-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* Social Sidebar */
.social-sidebar {
    position: fixed;
    bottom: 0;
    left: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    z-index: 10;
}

.social-sidebar a {
    color: var(--color-text-secondary);
    font-size: 1.4rem;
    transition: var(--transition-bounce);
    padding: 0.75rem;
    border-radius: 50%;
    background: rgba(26, 31, 53, 0.8);
    backdrop-filter: blur(10px);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.social-sidebar a:hover {
    color: var(--color-accent-copper);
    transform: translateY(-5px);
    background: rgba(211, 138, 92, 0.1);
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
}

.sidebar-line {
    width: 1px;
    height: 90px;
    background: linear-gradient(180deg, var(--color-text-secondary), transparent);
    opacity: 0.6;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

/* Prevent body scroll when menu is open */
body.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
}
/* Hide scrollbar during loading */
body.loading {
    overflow: hidden;
}

body.loading::-webkit-scrollbar {
    display: none;
}

/* Firefox */
body.loading {
    scrollbar-width: none;
}


/* Mobile Responsive Design */
@media (max-width: 1024px) {
    .main-container {
        padding: 0 1.5rem;
    }
    
    .social-sidebar {
        display: none;
    }
    
    .experience-tabs {
        flex-direction: column;
        gap: 2rem;
        min-height: auto;
    }
    
    .tab-list {
        flex-direction: row;
        overflow-x: auto;
        border-left: none;
        border-bottom: 2px solid var(--color-bg-light);
        padding: 0;
        margin-bottom: 1rem;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-button {
        border-left: none;
        border-bottom: 2px solid transparent;
        margin: 0;
        padding: 0.75rem 1rem;
        white-space: nowrap;
        min-width: 120px;
    }
    
    .tab-button.active {
        border-left: none;
        border-bottom-color: var(--color-accent-copper);
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .nav-links a {
        font-size: 0.8rem;
        padding: 0.5rem 0.75rem;
    }
}

@media (max-width: 768px) {
    html {
        scroll-snap-type: y proximity;
    }
    
    .main-container {
        padding: 0 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background: rgba(10, 14, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding: 2rem 0;
        transition: left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        gap: 0;
        overflow-y: auto;
    }
    
    .nav-links.open {
        left: 0;
    }
    
    .nav-links li {
        width: 90%;
        margin-bottom: 0.5rem;
    }
    
    .nav-links a {
        display: block;
        width: 100%;
        font-size: 1.1rem;
        padding: 1.2rem 2rem;
        text-align: center;
        border-radius: var(--border-radius);
        border: 1px solid transparent;
        transition: all 0.3s ease;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
        background: rgba(211, 138, 92, 0.15);
        border-color: var(--color-accent-copper);
        transform: translateX(5px);
    }
    
    .section {
        padding: calc(var(--header-height) + 2rem) 0 3rem;
        min-height: auto;
    }
    
    .section-container {
        padding: 0;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .hero-actions .button {
        width: 100%;
        max-width: 300px;
        justify-content: center;
        min-height: 48px;
        padding: 1rem 2rem;
        font-size: 1rem;
    }
    
    .contact-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .contact-buttons .button {
        width: 100%;
        max-width: 300px;
        justify-content: center;
        min-height: 48px;
        padding: 1rem 2rem;
        font-size: 1rem;
    }
    
    .education-grid,
    .skills-grid,
    .certifications-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .flip-card {
        height: 320px;
        margin-bottom: 1rem;
    }
    
    .flip-card:hover .card-inner {
        transform: none;
    }
    
    .section-title {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
    
    .section-title::after {
        margin-left: 1rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1.8rem;
        line-height: 1.3;
    }
    
    .hero-description {
        font-size: 1rem;
        line-height: 1.6;
        margin-bottom: 2rem;
    }
    
    .about-content p,
    .contact-description {
        font-size: 1rem;
        line-height: 1.6;
    }
}

@media (max-width: 480px) {
    .main-container {
        padding: 0 0.5rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .contact-title {
        font-size: 2rem;
    }
    
    .flip-card {
        height: 280px;
    }
    
    .card-front,
    .card-back {
        padding: 1.5rem;
    }
    
    .skills-list {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 0.75rem;
    }
    
    .skill-item {
        padding: 0.75rem;
        min-height: 70px;
    }
    
    .certifications-grid {
        gap: 1rem;
    }
    
    .cert-card {
        padding: 1.25rem;
    }
    
    .tab-button {
        padding: 0.75rem 0.75rem;
        font-size: 0.8rem;
        min-width: 100px;
    }
    
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }
    
    .section-title::after {
        margin-left: 0.5rem;
    }
}

/* Landscape orientation optimizations */
@media (max-width: 768px) and (orientation: landscape) {
    .section {
        min-height: auto;
        padding: calc(var(--header-height) + 1rem) 0 2rem;
    }
    
    .hero-section {
        min-height: 100vh;
    }
}

/* Accessibility & Performance */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .flip-card:hover .card-inner,
    .flip-card.mobile-flipped .card-inner {
        transform: none;
    }
    
    .loader {
        display: none;
    }
    
    .section {
        opacity: 1;
        transform: none;
    }
    
    .mobile-menu-toggle span {
        transition: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-bg: #000000;
        --color-bg-card: #1a1a1a;
        --color-text-primary: #ffffff;
        --color-text-secondary: #cccccc;
        --color-accent-copper: #ff6b35;
        --color-accent-cyan: #00ffff;
    }
}

/* Print Styles */
@media print {
    .loader,
    .main-header,
    .social-sidebar,
    #interactive-bg,
    .mobile-menu-toggle {
        display: none !important;
    }
    
    .section {
        page-break-inside: avoid;
        padding: 1rem 0;
        min-height: auto;
        opacity: 1;
        transform: none;
    }
    
    .flip-card .card-inner {
        transform: none !important;
    }
    
    .card-back {
        display: none;
    }
    
    .contact-buttons .button {
        border: 1px solid #000;
        color: #000;
        background: transparent;
    }
}