/* ============================================
   Prof. Poonam Sadafal - Portfolio Stylesheet
   Premium Academic Portfolio Design
   ============================================ */

/* === CSS Variables === */
:root {
    /* Primary Palette - Deep Academic Navy & Gold */
    --primary: #1a1a4e;
    --primary-light: #2d2d7c;
    --primary-dark: #0f0f2e;
    --accent: #c9a84c;
    --accent-light: #e0c86e;
    --accent-dark: #a88a34;

    /* Secondary */
    --secondary: #6c5ce7;
    --secondary-light: #a29bfe;

    /* Neutrals */
    --white: #ffffff;
    --off-white: #f8f9fc;
    --light-gray: #eef0f6;
    --medium-gray: #b0b5c9;
    --dark-gray: #4a4e69;
    --charcoal: #2b2d42;
    --near-black: #1a1b2e;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1a1a4e 0%, #2d2d7c 50%, #6c5ce7 100%);
    --gradient-accent: linear-gradient(135deg, #c9a84c 0%, #e0c86e 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.95), rgba(248, 249, 252, 0.9));
    --gradient-dark: linear-gradient(135deg, #0f0f2e 0%, #1a1a4e 100%);
    --gradient-hero: linear-gradient(135deg, #0f0f2e 0%, #1a1a4e 40%, #2d2d7c 70%, #6c5ce7 100%);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(26, 26, 78, 0.06);
    --shadow-md: 0 4px 20px rgba(26, 26, 78, 0.1);
    --shadow-lg: 0 8px 40px rgba(26, 26, 78, 0.15);
    --shadow-xl: 0 16px 60px rgba(26, 26, 78, 0.2);
    --shadow-glow: 0 0 30px rgba(201, 168, 76, 0.3);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --section-padding: 100px 0;
    --container-width: 1200px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset & Base === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scrollbar-width: thin;
    scrollbar-color: var(--accent) var(--primary-dark);
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

body {
    font-family: var(--font-primary);
    color: var(--charcoal);
    background-color: var(--off-white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================
   PRELOADER
   ============================ */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-hero);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

#preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loader-ring {
    width: 80px;
    height: 80px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-text {
    position: absolute;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 2px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ============================
   NAVIGATION
   ============================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(15, 15, 46, 0.95);
    backdrop-filter: blur(20px);
    padding: 12px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 1px;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    position: relative;
    letter-spacing: 0.3px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--white);
    background: rgba(201, 168, 76, 0.15);
}

.nav-link.active {
    color: var(--accent);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 28px;
    height: 2px;
    background: var(--white);
    position: relative;
    transition: var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 28px;
    height: 2px;
    background: var(--white);
    left: 0;
    transition: var(--transition-base);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.nav-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    top: 0;
}

/* ============================
   HERO SECTION
   ============================ */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--gradient-hero);
    background-image: var(--gradient-hero), url('assets/images/hero_bg.png');
    background-size: cover;
    background-position: right center;
    background-blend-mode: overlay;
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(201, 168, 76, 0.4);
    border-radius: 50%;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% {
        transform: translateY(100vh) scale(0);
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        transform: translateY(-10vh) scale(1);
        opacity: 0;
    }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(108, 92, 231, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(201, 168, 76, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(45, 45, 124, 0.2) 0%, transparent 50%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 60px;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 120px 24px 80px;
}

.hero-profile {
    flex-shrink: 0;
}

.profile-image-wrapper {
    position: relative;
    width: 220px;
    height: 220px;
}

.profile-image {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(201, 168, 76, 0.4);
    position: relative;
    z-index: 2;
}

.profile-ring {
    position: absolute;
    top: -8px;
    left: -8px;
    width: calc(100% + 16px);
    height: calc(100% + 16px);
    border: 2px solid rgba(201, 168, 76, 0.2);
    border-radius: 50%;
    animation: pulse-ring 3s ease-in-out infinite;
}

@keyframes pulse-ring {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.05);
        opacity: 0.5;
    }
}

.hero-text {
    flex: 1;
}

.hero-greeting {
    font-size: 0.95rem;
    color: var(--accent);
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 12px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.3s;
}

.hero-name {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 16px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.5s;
}

.name-accent {
    color: var(--accent);
    display: inline-block;
}

.hero-title-wrapper {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.7s;
}

.hero-title-line {
    flex: 0 0 40px;
    height: 2px;
    background: var(--accent);
}

.hero-title {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.hero-subtitle {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 32px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.9s;
}

.hero-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 36px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 1.1s;
}

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

.stat-number {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--accent);
    display: inline;
}

.stat-plus {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--accent);
}

.stat-label {
    display: block;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 4px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 1.3s;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    cursor: pointer;
    border: none;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--primary-dark);
    box-shadow: 0 4px 20px rgba(201, 168, 76, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(201, 168, 76, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 1.8s;
}

.scroll-text {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.scroll-arrow {
    color: var(--accent);
    animation: bounce 2s ease infinite;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(8px);
    }

    60% {
        transform: translateY(4px);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================
   SECTIONS - Global Styles
   ============================ */
.section {
    padding: var(--section-padding);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-dark);
    text-transform: uppercase;
    letter-spacing: 3px;
    background: rgba(201, 168, 76, 0.1);
    padding: 8px 20px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 12px;
}

.text-accent {
    color: var(--secondary);
}

.section-line {
    width: 60px;
    height: 3px;
    background: var(--gradient-accent);
    margin: 0 auto;
    border-radius: 2px;
}

/* Fade-in animation for sections */
.section .container {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ============================
   ABOUT SECTION
   ============================ */
.about-section {
    background: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
    align-items: start;
}

.about-intro {
    font-size: 1.1rem;
    color: var(--charcoal);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-desc {
    color: var(--dark-gray);
    margin-bottom: 30px;
    line-height: 1.8;
}

.about-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    border-radius: 12px;
    background: var(--off-white);
    transition: var(--transition-base);
}

.info-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.info-item i {
    font-size: 1.2rem;
    color: var(--secondary);
    margin-top: 2px;
    flex-shrink: 0;
}

.info-label {
    display: block;
    font-size: 0.78rem;
    color: var(--medium-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2px;
}

.info-value {
    display: block;
    font-weight: 600;
    color: var(--charcoal);
    font-size: 0.92rem;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.highlight-card {
    padding: 28px;
    border-radius: 16px;
    background: var(--off-white);
    border: 1px solid var(--light-gray);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.highlight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-accent);
    transition: var(--transition-base);
}

.highlight-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.highlight-card:hover::before {
    width: 6px;
}

.highlight-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.highlight-icon i {
    color: var(--accent);
    font-size: 1.2rem;
}

.highlight-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 8px;
}

.highlight-card p {
    font-size: 0.9rem;
    color: var(--dark-gray);
    line-height: 1.6;
}

/* ============================
   EDUCATION SECTION
   ============================ */
.education-section {
    background: var(--off-white);
}

.education-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.education-timeline::before {
    content: '';
    position: absolute;
    left: 28px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--accent), var(--secondary));
    border-radius: 2px;
}

.timeline-item {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    position: relative;
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible .timeline-item {
    opacity: 1;
    transform: translateX(0);
}

.section.visible .timeline-item:nth-child(1) {
    transition-delay: 0.1s;
}

.section.visible .timeline-item:nth-child(2) {
    transition-delay: 0.2s;
}

.section.visible .timeline-item:nth-child(3) {
    transition-delay: 0.3s;
}

.section.visible .timeline-item:nth-child(4) {
    transition-delay: 0.4s;
}

.timeline-marker {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    z-index: 2;
    box-shadow: 0 0 0 5px var(--off-white), 0 0 0 8px rgba(108, 92, 231, 0.2);
}

.timeline-marker i {
    color: var(--accent);
    font-size: 1.1rem;
}

.timeline-card {
    flex: 1;
    background: var(--white);
    border-radius: 16px;
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--light-gray);
    transition: var(--transition-base);
}

.timeline-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.timeline-badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.timeline-badge.pursuing {
    background: rgba(108, 92, 231, 0.1);
    color: var(--secondary);
}

.timeline-badge.completed {
    background: rgba(201, 168, 76, 0.1);
    color: var(--accent-dark);
}

.timeline-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 8px;
}

.timeline-institution {
    font-size: 0.9rem;
    color: var(--dark-gray);
    margin-bottom: 6px;
}

.timeline-institution i {
    color: var(--secondary);
    margin-right: 6px;
}

.timeline-detail {
    font-size: 0.85rem;
    color: var(--medium-gray);
    font-weight: 500;
}

/* ============================
   EXPERIENCE SECTION
   ============================ */
.experience-section {
    background: var(--white);
}

.experience-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.exp-card {
    background: var(--off-white);
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--light-gray);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.exp-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-slow);
}

.exp-card:hover::before {
    transform: scaleX(1);
}

.exp-card.current {
    background: var(--gradient-dark);
    border-color: rgba(201, 168, 76, 0.2);
    grid-column: 1 / -1;
}

.exp-card.current::before {
    background: var(--gradient-accent);
    transform: scaleX(1);
}

.exp-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.exp-duration {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.exp-date {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--dark-gray);
}

.exp-card.current .exp-date {
    color: rgba(255, 255, 255, 0.7);
}

.exp-badge {
    padding: 3px 12px;
    border-radius: 50px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: var(--gradient-accent);
    color: var(--primary-dark);
}

.exp-role {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 8px;
}

.exp-card.current .exp-role {
    color: var(--white);
}

.exp-org {
    font-size: 0.92rem;
    color: var(--dark-gray);
    margin-bottom: 16px;
}

.exp-org i {
    color: var(--secondary);
    margin-right: 6px;
}

.exp-card.current .exp-org {
    color: rgba(255, 255, 255, 0.6);
}

.exp-card.current .exp-org i {
    color: var(--accent);
}

.exp-responsibilities {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.resp-tag {
    padding: 5px 14px;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 500;
    background: rgba(108, 92, 231, 0.08);
    color: var(--secondary);
    border: 1px solid rgba(108, 92, 231, 0.15);
}

.exp-card.current .resp-tag {
    background: rgba(201, 168, 76, 0.12);
    color: var(--accent-light);
    border-color: rgba(201, 168, 76, 0.2);
}

/* Subjects */
.subjects-section {
    margin-top: 20px;
}

.subsection-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.subsection-title i {
    color: var(--secondary);
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.subject-chip {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    border-radius: 12px;
    background: var(--off-white);
    border: 1px solid var(--light-gray);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--charcoal);
    transition: var(--transition-base);
}

.subject-chip:hover {
    border-color: var(--accent);
    background: rgba(201, 168, 76, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.subject-chip i {
    color: var(--secondary);
    font-size: 1rem;
}

/* ============================
   PUBLICATIONS SECTION
   ============================ */
.publications-section {
    background: var(--near-black);
    color: var(--white);
}

.publications-section .section-title {
    color: var(--white);
}

.publications-section .section-tag {
    background: rgba(201, 168, 76, 0.15);
    color: var(--accent);
}

.pub-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 50px;
}

.pub-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 28px;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.pub-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-accent);
    opacity: 0;
    transition: var(--transition-base);
}

.pub-card:hover {
    background: rgba(255, 255, 255, 0.07);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
    border-color: rgba(201, 168, 76, 0.2);
}

.pub-card:hover::before {
    opacity: 1;
}

.pub-year {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    opacity: 0.3;
    margin-bottom: 12px;
}

.pub-type {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 50px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.pub-type.journal {
    background: rgba(108, 92, 231, 0.2);
    color: var(--secondary-light);
}

.pub-type.conference {
    background: rgba(201, 168, 76, 0.15);
    color: var(--accent);
}

.pub-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    line-height: 1.5;
    margin-bottom: 12px;
}

.pub-authors,
.pub-venue {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 4px;
}

.pub-authors i,
.pub-venue i {
    margin-right: 6px;
    color: var(--secondary-light);
    opacity: 0.6;
}

.pub-citations {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 10px;
    padding: 4px 12px;
    border-radius: 50px;
    background: rgba(201, 168, 76, 0.12);
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 600;
}

/* Book & Copyrights */
.book-copyrights-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.book-card,
.copyrights-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 32px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    transition: var(--transition-base);
}

.book-card:hover,
.copyrights-card:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(201, 168, 76, 0.2);
}

.book-icon,
.copyright-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.book-icon i,
.copyright-icon i {
    font-size: 1.3rem;
    color: var(--primary-dark);
}

.book-info h3,
.copyright-info h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 8px;
}

.book-info h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 10px;
}

.book-info p {
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 4px;
}

.copyright-info ul {
    list-style: none;
    flex: 1;
}

.copyright-item {
    display: flex;
    gap: 15px;
    align-items: center;
    margin-top: 10px;
}

.copyright-thumb {
    width: 60px;
    height: 80px;
    object-fit: cover;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: var(--transition-base);
}

.copyright-thumb:hover {
    transform: scale(1.1);
    border-color: var(--accent);
}

.copyright-info li {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    padding-left: 16px;
    position: relative;
    margin-bottom: 8px;
    line-height: 1.5;
}

.copyright-info li::before {
    content: '©';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 0.8rem;
}

/* ============================
   CERTIFICATIONS SECTION
   ============================ */
.certifications-section {
    background: var(--white);
}

.cert-showcase {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.cert-main-photo {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.photo-frame {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 8px solid var(--white);
}

.action-photo {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition-slow);
}

.photo-frame:hover .action-photo {
    transform: scale(1.02);
}

.photo-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 20px;
    background: linear-gradient(to top, rgba(15, 15, 46, 0.9), transparent);
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
}

.cert-secondary-photos {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.action-photo-secondary {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
    transition: var(--transition-slow);
}

.cert-secondary-photos .photo-frame {
    border-width: 6px;
    box-shadow: var(--shadow-lg);
}

.cert-secondary-photos .photo-frame:hover .action-photo-secondary {
    transform: scale(1.03);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.cert-card {
    background: var(--off-white);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--light-gray);
    transition: var(--transition-base);
}

.cert-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.cert-img-container.missing-img {
    background: linear-gradient(135deg, #1a1a4e 0%, #2d2d7c 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-img-container.missing-img::after {
    content: '\f15b';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 3rem;
    color: rgba(201, 168, 76, 0.2);
}

.cert-img-container.missing-img img {
    display: none;
}

.cert-thumbnail {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.cert-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 26, 78, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-base);
}

.cert-card:hover .cert-overlay {
    opacity: 1;
}

.view-btn {
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 10px 20px;
    border: 2px solid var(--accent);
    border-radius: 50px;
}

.cert-info {
    padding: 20px;
}

.cert-info h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 6px;
    line-height: 1.4;
}

.cert-info p {
    font-size: 0.82rem;
    color: var(--dark-gray);
    margin-bottom: 8px;
}

.cert-date {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary);
    background: rgba(108, 92, 231, 0.08);
    padding: 3px 10px;
    border-radius: 4px;
}

/* ============================
   SKILLS SECTION
   ============================ */
.skills-section {
    background: var(--off-white);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.skill-category {
    text-align: center;
    padding: 36px 24px;
    border-radius: 16px;
    background: var(--white);
    border: 1px solid var(--light-gray);
    transition: var(--transition-base);
}

.skill-category:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.skill-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.skill-icon i {
    font-size: 1.4rem;
    color: var(--accent);
}

.skill-category h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 16px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.skill-tag {
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    background: rgba(108, 92, 231, 0.08);
    color: var(--secondary);
    border: 1px solid rgba(108, 92, 231, 0.12);
    transition: var(--transition-base);
}

.skill-tag:hover {
    background: var(--secondary);
    color: var(--white);
    transform: translateY(-1px);
}

/* Responsibilities */
.responsibilities-section {
    margin-top: 20px;
}

.resp-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.resp-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-radius: 12px;
    background: var(--white);
    border: 1px solid var(--light-gray);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--charcoal);
    transition: var(--transition-base);
}

.resp-item:hover {
    border-color: var(--secondary);
    transform: translateX(4px);
}

.resp-item i {
    color: var(--accent-dark);
    font-size: 0.95rem;
    flex-shrink: 0;
}

/* ============================
   ACHIEVEMENTS SECTION
   ============================ */
.achievements-section {
    background: var(--white);
    position: relative;
    overflow: hidden;
}

.achievements-section::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: rgba(201, 168, 76, 0.04);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.achievement-card {
    text-align: center;
    padding: 40px 28px;
    border-radius: 16px;
    background: var(--off-white);
    border: 1px solid var(--light-gray);
    transition: var(--transition-base);
    position: relative;
}

.achievement-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.ach-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: var(--shadow-glow);
}

.ach-icon i {
    font-size: 1.6rem;
    color: var(--primary-dark);
}

.achievement-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 10px;
}

.achievement-card p {
    font-size: 0.88rem;
    color: var(--dark-gray);
    line-height: 1.6;
    margin-bottom: 14px;
}

.ach-years {
    display: flex;
    justify-content: center;
    gap: 8px;
}

.ach-years span {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(108, 92, 231, 0.08);
    color: var(--secondary);
}

/* ============================
   CONTACT SECTION
   ============================ */
.contact-section {
    background: var(--off-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.contact-info h3 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 12px;
}

.contact-info>p {
    color: var(--dark-gray);
    margin-bottom: 32px;
    line-height: 1.7;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    color: var(--accent);
    font-size: 1rem;
}

.contact-label {
    display: block;
    font-size: 0.78rem;
    color: var(--medium-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2px;
}

.contact-value {
    font-weight: 500;
    color: var(--charcoal);
    font-size: 0.92rem;
    line-height: 1.5;
}

a.contact-value:hover {
    color: var(--secondary);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--white);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--light-gray);
}

.form-group {
    position: relative;
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--light-gray);
    border-radius: 12px;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    color: var(--charcoal);
    background: var(--off-white);
    transition: var(--transition-base);
    outline: none;
}

.form-group label {
    position: absolute;
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    font-size: 0.9rem;
    color: var(--medium-gray);
    pointer-events: none;
    transition: var(--transition-base);
    background: var(--off-white);
    padding: 0 6px;
    opacity: 0;
}

.form-group textarea+label {
    top: 20px;
    transform: translateY(0);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--secondary);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(108, 92, 231, 0.08);
}

.form-group input:focus+label,
.form-group textarea:focus+label,
.form-group input:not(:placeholder-shown)+label,
.form-group textarea:not(:placeholder-shown)+label {
    top: -2px;
    font-size: 0.75rem;
    color: var(--secondary);
    opacity: 1;
    background: var(--white);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn-primary {
    font-family: var(--font-primary);
    font-size: 1rem;
    padding: 16px 32px;
}

/* ============================
   FOOTER
   ============================ */
.footer {
    background: var(--gradient-dark);
    color: var(--white);
    padding: 50px 0 0;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 4px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition-base);
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition-base);
}

.social-link:hover {
    background: var(--accent);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding: 20px 0;
}

.footer-bottom p {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ============================
   BACK TO TOP
   ============================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-accent);
    color: var(--primary-dark);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition-base);
    box-shadow: 0 4px 20px rgba(201, 168, 76, 0.3);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 30px rgba(201, 168, 76, 0.5);
}

/* ============================
   RESPONSIVE DESIGN
   ============================ */
@media (max-width: 1024px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-title-wrapper {
        justify-content: center;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .pub-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .subjects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .resp-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 70px 0;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: rgba(15, 15, 46, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 100px 30px 40px;
        transition: var(--transition-base);
        gap: 4px;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-toggle {
        display: block;
    }

    .nav-link {
        font-size: 1.05rem;
        padding: 12px 16px;
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .profile-image-wrapper {
        width: 160px;
        height: 160px;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }

    .stat-item {
        flex: 1 1 45%;
    }

    .section-title {
        font-size: 2rem;
    }

    .experience-grid {
        grid-template-columns: 1fr;
    }

    .exp-card.current {
        grid-column: auto;
    }

    .pub-grid {
        grid-template-columns: 1fr;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .achievements-grid {
        grid-template-columns: 1fr;
    }

    .cert-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .book-copyrights-row {
        grid-template-columns: 1fr;
    }

    .about-info-grid {
        grid-template-columns: 1fr;
    }

    .subjects-grid {
        grid-template-columns: 1fr;
    }

    .resp-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .contact-form-wrapper {
        padding: 28px;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 0.95rem;
    }

    .hero-title-line {
        display: none;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.7rem;
    }

    .education-timeline::before {
        left: 20px;
    }

    .timeline-marker {
        width: 42px;
        height: 42px;
    }

    .timeline-card {
        padding: 20px;
    }
}