/* ===================================
   CSS CUSTOM PROPERTIES & RESET
   =================================== */
:root {
    /* Cloud-inspired Color Palette */
    --color-deep-blue: #0A2463;
    --color-royal-blue: #1E3A8A;
    --color-sky-blue: #3B82F6;
    --color-slate-dark: #1E293B;
    --color-slate-mid: #334155;
    --color-slate-light: #64748B;
    --color-white: #FFFFFF;
    --color-cyan: #06B6D4;
    --color-cyan-light: #22D3EE;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-royal-blue) 0%, var(--color-sky-blue) 50%, var(--color-cyan) 100%);
    --gradient-hero: linear-gradient(180deg, var(--color-deep-blue) 0%, var(--color-slate-dark) 100%);
    --gradient-card: linear-gradient(135deg, rgba(30, 58, 138, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.875rem;
    --font-size-sm: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.5rem;
    --font-size-xl: 2rem;
    --font-size-2xl: 2.5rem;
    --font-size-3xl: 3.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

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

body {
    font-family: var(--font-family);
    color: var(--color-white);
    background-color: var(--color-slate-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===================================
   TYPOGRAPHY
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===================================
   LAYOUT UTILITIES
   =================================== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--gradient-primary);
    margin: var(--spacing-md) auto 0;
    border-radius: 2px;
}

/* ===================================
   HERO SECTION
   =================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--gradient-hero);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

/* Profile Image */
.hero-profile-container {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto var(--spacing-lg);
    z-index: 2;
}

.hero-profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 2;
}

.hero-profile-blob {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle at center, rgba(99, 102, 241, 0.4) 0%, rgba(139, 92, 246, 0.1) 70%, transparent 100%);
    border-radius: 50%;
    z-index: 1;
    filter: blur(10px);
}

.hero-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
    font-weight: 800;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-cyan-light);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

.hero-description {
    font-size: var(--font-size-md);
    color: var(--color-slate-light);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

/* ===================================
   BUTTONS
   =================================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-white);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-icon {
    transition: transform var(--transition-base);
}

.btn-primary:hover .btn-icon {
    transform: translateX(4px);
}

/* ===================================
   SCROLL INDICATOR
   =================================== */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-arrow {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-cyan);
    border-radius: 12px;
    position: relative;
}

.scroll-arrow::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-cyan);
    border-radius: 2px;
    animation: scroll-down 2s ease-in-out infinite;
}

/* ===================================
   VALUE PROPOSITION SECTION
   =================================== */
.value-section {
    background: var(--color-slate-dark);
    position: relative;
}

.value-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.value-text {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-slate-light);
}

.value-text strong {
    color: var(--color-cyan-light);
    font-weight: 600;
}

/* ===================================
   EXPERTISE SECTION
   =================================== */
.expertise-section {
    background: linear-gradient(180deg, var(--color-slate-dark) 0%, var(--color-deep-blue) 100%);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.expertise-card {
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.expertise-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
    border-radius: var(--radius-xl);
    color: var(--color-cyan-light);
    transition: all var(--transition-base);
}

.expertise-card:hover .card-icon {
    transform: scale(1.1);
    background: var(--gradient-primary);
    color: var(--color-white);
}

.card-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.card-list {
    list-style: none;
    text-align: left;
}

.card-list li {
    padding: var(--spacing-xs) 0;
    color: var(--color-slate-light);
    position: relative;
    padding-left: var(--spacing-lg);
}

.card-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-cyan);
    font-weight: bold;
}

/* ===================================
   GLASSMORPHISM CARD
   =================================== */
.card-glass {
    background: rgba(30, 58, 138, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

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

.experience-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.experience-card {
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    position: relative;
}

.experience-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: height var(--transition-base);
}

.experience-card:hover::before {
    height: 100%;
}

.experience-card:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-xl);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.experience-company {
    font-size: var(--font-size-lg);
    color: var(--color-cyan-light);
}

.experience-industry {
    font-size: var(--font-size-xs);
    color: var(--color-slate-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(100, 116, 139, 0.2);
    border-radius: var(--radius-sm);
}

.experience-description {
    color: var(--color-slate-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.experience-description strong {
    color: var(--color-white);
}

.experience-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-sm);
    color: var(--color-cyan-light);
}

/* ===================================
   SKILLS SECTION
   =================================== */
.skills-section {
    background: linear-gradient(180deg, var(--color-deep-blue) 0%, var(--color-slate-dark) 100%);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.skill-item {
    text-align: center;
    padding: var(--spacing-lg);
    transition: transform var(--transition-base);
}

.skill-item:hover {
    transform: scale(1.05);
}

.skill-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
    border-radius: 50%;
    color: var(--color-cyan-light);
    transition: all var(--transition-base);
}

.skill-item:hover .skill-icon {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-glow);
}

.skill-name {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.skill-description {
    font-size: var(--font-size-sm);
    color: var(--color-slate-light);
}

/* ===================================
   CONTACT SECTION
   =================================== */
.contact-section {
    background: var(--color-slate-dark);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.contact-info {
    padding: var(--spacing-xl);
}

.contact-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-cyan-light);
}

.education-text {
    color: var(--color-slate-light);
    line-height: 1.8;
}

.education-text strong {
    color: var(--color-white);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-slate-light);
    text-decoration: none;
    transition: all var(--transition-base);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
}

.contact-link:hover {
    color: var(--color-cyan-light);
    background: rgba(6, 182, 212, 0.1);
    transform: translateX(4px);
}

.contact-link svg {
    flex-shrink: 0;
    color: var(--color-cyan);
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background: var(--color-deep-blue);
    padding: var(--spacing-xl) 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-text {
    color: var(--color-slate-light);
    font-size: var(--font-size-sm);
}

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

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

@keyframes scroll-down {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    50% {
        transform: translateX(-50%) translateY(12px);
        opacity: 0;
    }
}

.animate-fade-in-up {
    animation: fadeInUp 1s ease-out forwards;
    opacity: 0;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.6s;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 1024px) {
    :root {
        --font-size-3xl: 2.5rem;
        --font-size-2xl: 2rem;
        --font-size-xl: 1.5rem;
    }
    
    .hero-section {
        min-height: 90vh;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2rem;
        --font-size-2xl: 1.75rem;
        --font-size-xl: 1.25rem;
        --spacing-3xl: 4rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    section {
        padding: var(--spacing-2xl) 0;
    }
    
    .expertise-grid,
    .experience-timeline,
    .skills-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .btn-primary {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.5rem;
        --spacing-2xl: 2.5rem;
    }
    
    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ===================================
   ACCESSIBILITY
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-cyan);
}

/* ===================================
   LANGUAGE SWITCHER
   =================================== */
.language-switcher {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    display: flex;
    gap: var(--spacing-xs);
    background: rgba(30, 58, 138, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xs);
    box-shadow: var(--shadow-lg);
}

.lang-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    font-family: var(--font-family);
    color: var(--color-slate-light);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.lang-btn:hover {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.1);
}

.lang-btn.active {
    color: var(--color-white);
    background: var(--gradient-primary);
    box-shadow: var(--shadow-md);
}

.lang-btn:focus-visible {
    outline: 2px solid var(--color-cyan);
    outline-offset: 2px;
}

/* Responsive language switcher */
@media (max-width: 768px) {
    .language-switcher {
        top: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .lang-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
}