/* ===================================
   Variables & Reset
   =================================== */
:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary-color: #8b5cf6;
    --accent-color: #10b981;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    color: var(--text-dark);
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* ===================================
   Utilities
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===================================
   Header & Navigation
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    cursor: pointer;
}

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

.nav-links a {
    font-weight: 500;
    color: var(--text-gray);
    position: relative;
    transition: color 0.3s ease;
}

.nav-links a:not(.btn-primary):hover {
    color: var(--primary-color);
}

.nav-links a:not(.btn-primary)::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-links a:not(.btn-primary):hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* ===================================
   Buttons
   =================================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

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

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    padding: 10rem 0 6rem;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #ddd6fe 100%);
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    animation: fadeInUp 0.8s ease;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: white;
    color: var(--primary-color);
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 2.5rem;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 4rem;
    animation: fadeInUp 0.8s ease 0.5s both;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 4rem;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.stat:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-gray);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    font-weight: 500;
}

.hero-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    z-index: 1;
}

.circle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
}

.circle-1 {
    width: 500px;
    height: 500px;
    background: var(--primary-color);
    top: -250px;
    right: -100px;
    animation: float 20s infinite ease-in-out;
}

.circle-2 {
    width: 300px;
    height: 300px;
    background: var(--secondary-color);
    bottom: -150px;
    left: -100px;
    animation: float 15s infinite ease-in-out reverse;
}

.circle-3 {
    width: 200px;
    height: 200px;
    background: var(--accent-color);
    top: 50%;
    right: 10%;
    animation: float 25s infinite ease-in-out;
}

/* ===================================
   Sections
   =================================== */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--bg-light);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* ===================================
   About Section
   =================================== */
.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.lead {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.highlights h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.highlight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.highlight-item {
    display: flex;
    align-items: start;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

.highlight-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.highlight-item span {
    color: var(--text-gray);
    line-height: 1.6;
}

/* ===================================
   Timeline (Experience Section)
   =================================== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
}

.timeline-item {
    position: relative;
    padding-left: 3rem;
    margin-bottom: 3rem;
    animation: fadeInUp 0.6s ease;
}

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 3px solid white;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.timeline-content {
    padding: 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.timeline-content:hover {
    box-shadow: var(--shadow-xl);
    transform: translateX(5px);
}

.job-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.job-title {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.company {
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.location {
    color: var(--text-light);
    font-size: 0.875rem;
}

.job-date {
    color: var(--text-gray);
    font-weight: 500;
    background: var(--bg-light);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
}

.job-highlights {
    list-style: none;
    padding: 0;
}

.job-highlights li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-gray);
    line-height: 1.7;
}

.job-highlights li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* ===================================
   Skills Section
   =================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.skill-card {
    padding: 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.skill-icon {
    width: 48px;
    height: 48px;
    padding: 12px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    color: white;
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
}

.skill-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    color: var(--text-gray);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tag:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* ===================================
   Certifications Section
   =================================== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.cert-card {
    padding: 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s ease;
}

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

.cert-badge {
    width: 64px;
    height: 64px;
    padding: 16px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    color: white;
    border-radius: 50%;
}

.cert-card h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.cert-card p {
    color: var(--text-gray);
    font-size: 0.875rem;
}

/* ===================================
   Contact Section
   =================================== */
.contact-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.contact-subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 3rem;
    line-height: 1.8;
}

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

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    font-weight: 600;
    color: var(--text-dark);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.contact-btn svg {
    width: 24px;
    height: 24px;
}

.contact-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* ===================================
   Footer
   =================================== */
.footer {
    padding: 2rem 0;
    background: var(--text-dark);
    color: white;
    text-align: center;
}

.footer p {
    color: rgba(255, 255, 255, 0.7);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(5deg);
    }
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
    }

    .nav-links.active {
        left: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

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

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

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

    .hero {
        padding: 8rem 0 4rem;
    }

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

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

    .hero-cta {
        flex-direction: column;
    }

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

    .timeline::before {
        left: 7px;
    }

    .timeline-item {
        padding-left: 2.5rem;
    }

    .job-header {
        flex-direction: column;
    }

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

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

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

    .contact-links {
        flex-direction: column;
        align-items: stretch;
    }
}

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

    .section {
        padding: 3rem 0;
    }

    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .header,
    .hero-decoration,
    .footer {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }
}