:root {
    /* Colors */
    --clr-bg: #ffffff;
    --clr-bg-light: #f8fafc;
    --clr-primary: #2563eb;
    --clr-primary-dark: #1d4ed8;
    --clr-primary-light: #dbeafe;
    --clr-accent: #3b82f6;
    --clr-text: #0f172a;
    --clr-text-muted: #475569;
    --clr-border: #e2e8f0;
    
    /* Typography */
    --font-main: 'Inter', sans-serif;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-main);
    color: var(--clr-text);
    background-color: var(--clr-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    color: var(--clr-text);
}

a {
    text-decoration: none;
    color: var(--clr-primary);
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
}

.bg-light {
    background-color: var(--clr-bg-light);
}

.bg-blue-subtle {
    background-color: #f0f7ff;
}

.section-header {
    margin-bottom: 4rem;
    text-align: center;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--clr-text);
}

.section-subtitle {
    color: var(--clr-text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.divider {
    height: 4px;
    width: 60px;
    background-color: var(--clr-primary);
    margin: 0 auto;
    border-radius: 2px;
}

.align-left {
    margin: 0;
}

.text-blue {
    color: var(--clr-primary);
}

.text-white {
    color: white;
}

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

.w-100 {
    width: 100%;
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--clr-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--clr-primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--clr-bg-light);
    color: var(--clr-text);
    border-color: var(--clr-border);
}

.btn-secondary:hover {
    background-color: #e2e8f0;
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background-color: var(--clr-primary);
    color: white;
}

.btn-video {
    background-color: #fce7f3;
    color: #be185d;
    border: none;
}

.btn-video:hover {
    background-color: #fbcfe8;
    color: #9d174d;
    transform: translateY(-2px);
}

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Navbar */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--clr-primary);
    text-decoration: none;
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--clr-text-muted);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--clr-primary);
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--clr-text);
}

/* 1. Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
    background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-title {
    font-size: 4rem;
    letter-spacing: -1.5px;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-title span {
    color: var(--clr-primary);
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--clr-text-muted);
    font-weight: 400;
    margin-bottom: 2rem;
}

.hero-intro {
    font-size: 1.125rem;
    color: var(--clr-text-muted);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.hero-shape {
    position: absolute;
    right: -10%;
    top: 20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59,130,246,0.1) 0%, rgba(255,255,255,0) 70%);
    border-radius: 50%;
    z-index: 1;
}

/* 2. About Section */
.about-content {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
    align-items: center;
}

.about-text .lead {
    font-size: 1.25rem;
    color: var(--clr-text);
    margin-bottom: 1.5rem;
}

.about-text p {
    color: var(--clr-text-muted);
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.about-image-container {
    position: relative;
}

.about-profile-img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    display: block;
}

.about-badge {
    position: absolute;
    bottom: -20px;
    left: -20px;
    background: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--clr-text);
}

.about-badge i {
    color: var(--clr-primary);
    font-size: 1.5rem;
}

/* 3. Experience */
.experience-card {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--clr-border);
    max-width: 800px;
    margin: 0 auto;
    transition: var(--transition);
}

.experience-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--clr-primary-light);
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--clr-border);
}

.role-title {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.company-name {
    font-size: 1.1rem;
    color: var(--clr-text-muted);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.badge {
    background-color: var(--clr-primary-light);
    color: var(--clr-primary-dark);
    padding: 0.5rem 1rem;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
}

.resp-title {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.resp-list li {
    margin-bottom: 0.75rem;
    color: var(--clr-text-muted);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.resp-list i {
    color: var(--clr-primary);
    margin-top: 5px;
}

/* 4. Feedback Action */
.feedback-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feedback-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    text-align: center;
    position: relative;
    border-top: 4px solid var(--clr-primary);
    transition: var(--transition);
}

.feedback-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feedback-icon {
    width: 60px;
    height: 60px;
    background: var(--clr-primary-light);
    color: var(--clr-primary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    margin: 0 auto 1.5rem;
}

.label-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

.label-feedback {
    background: #f1f5f9;
    color: #64748b;
}

.label-action {
    background: #dcfce7;
    color: #166534;
}

.feedback-box p {
    font-weight: 500;
    font-size: 1rem;
    margin-bottom: 1.5rem;
    color: var(--clr-text);
}

.action-arrow {
    color: var(--clr-primary);
    margin: 1rem 0;
}

.action-box p {
    color: var(--clr-text-muted);
    font-size: 0.95rem;
}

/* 5. Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background: var(--clr-primary-light);
    top: 0;
    bottom: 0;
    left: 40px;
    margin-left: -1px;
}

.timeline-item {
    padding: 0 0 4rem 100px;
    position: relative;
}

.timeline-dot {
    position: absolute;
    width: 24px;
    height: 24px;
    background: var(--clr-primary);
    border: 4px solid white;
    border-radius: 50%;
    left: 28px;
    top: 0;
    z-index: 1;
    box-shadow: 0 0 0 2px var(--clr-primary-light);
}

.timeline-date {
    font-weight: 700;
    color: var(--clr-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.timeline-content {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--clr-border);
}

.timeline-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.topics-wrapper h4 {
    font-size: 1rem;
    color: var(--clr-text-muted);
    margin-bottom: 0.75rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tags span {
    background: var(--clr-bg-light);
    color: var(--clr-text);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 0.875rem;
    border: 1px solid var(--clr-border);
}

.outcome-box {
    background: var(--clr-primary-light);
    padding: 1.25rem;
    border-radius: 8px;
    border-left: 4px solid var(--clr-primary);
}

.outcome-box h4 {
    color: var(--clr-primary-dark);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.outcome-box p {
    color: var(--clr-text);
    margin: 0;
    font-size: 0.95rem;
}

/* 6. Videos */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.video-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.video-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.video-thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    background: linear-gradient(45deg, #1e293b, #334155);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.video-thumbnail::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.2);
    transition: var(--transition);
}

.video-card:hover .video-thumbnail::after {
    background: rgba(0,0,0,0.4);
}

.play-button {
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.9);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--clr-primary);
    font-size: 1.5rem;
    z-index: 2;
    transition: var(--transition);
    padding-left: 5px; /* Visual center adjustment for play icon */
}

.video-card:hover .play-button {
    transform: scale(1.1);
    background: white;
}

.video-info {
    padding: 1.5rem;
}

.video-info h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.video-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

/* 7 & 9. Presentation & Tracker */
.two-col-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.presentation-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--clr-border);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.presentation-icon {
    font-size: 4rem;
    color: #eb4f27; /* PPT color */
    margin-bottom: 1.5rem;
}

.pres-desc {
    color: var(--clr-text-muted);
    margin-bottom: 2rem;
}

.pres-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.tracker-table-container {
    background: white;
    border-radius: 12px;
    border: 1px solid var(--clr-border);
    overflow: hidden;
}

.tracker-table {
    width: 100%;
    border-collapse: collapse;
}

.tracker-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--clr-border);
}

.tracker-table tr:last-child td {
    border-bottom: none;
}

.day-col {
    width: 30%;
}

.day-badge {
    background: var(--clr-bg-light);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--clr-text-muted);
}

.day-badge.highlight {
    background: var(--clr-primary);
    color: white;
}

.success-row {
    background-color: #f0fdf4;
}

/* 8. Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--clr-border);
    transition: var(--transition);
}

.project-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--clr-primary-light);
    transform: translateY(-5px);
}

.project-category {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--clr-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.75rem;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.project-desc {
    color: var(--clr-text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tech span {
    font-size: 0.75rem;
    background: var(--clr-bg-light);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    color: var(--clr-text-muted);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

/* 10. Lessons */
#lessons {
    background: var(--clr-primary);
    position: relative;
    padding: 6rem 0;
}

.lessons-container {
    background: var(--clr-primary-dark);
    border-radius: 20px;
    padding: 4rem;
    box-shadow: var(--shadow-lg);
}

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.lesson-item {
    text-align: center;
    color: white;
}

.lesson-icon {
    font-size: 2.5rem;
    color: #60a5fa;
    margin-bottom: 1.5rem;
}

.lesson-item p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* 11. Contact */
.contact-card {
    background: white;
    border-radius: 16px;
    padding: 3rem;
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--clr-text);
}

.contact-item:hover {
    color: var(--clr-primary);
}

.icon-wrap {
    width: 60px;
    height: 60px;
    background: var(--clr-bg-light);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.75rem;
    transition: var(--transition);
}

.contact-item:hover .icon-wrap {
    background: var(--clr-primary-light);
    transform: scale(1.1);
}

.contact-action {
    padding-top: 3rem;
    border-top: 1px solid var(--clr-border);
}

.contact-action p {
    margin-bottom: 1rem;
    color: var(--clr-text-muted);
}

/* Footer */
footer {
    background: #0f172a;
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.footer-content p {
    color: #94a3b8;
    margin-bottom: 0.5rem;
}

.footer-small {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Animations & Reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Responsive */
@media (max-width: 992px) {
    .about-content,
    .two-col-layout {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-title span {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-md);
        text-align: center;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .hamburger {
        display: block;
    }
    
    .timeline::after {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
    
    .timeline-dot {
        left: 8px;
    }
    
    .lessons-container {
        padding: 2rem;
    }
    
    .hero-shape {
        display: none;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-title span {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .feedback-card, .project-card, .video-card {
        padding: 1.5rem;
    }
    
    .pres-actions {
        flex-direction: column;
    }
    
    .contact-links {
        gap: 1.5rem;
    }
}