/* ===========================
   CSS Variables & Design System
   =========================== */
:root {
    /* Colors - Clean, professional palette */
    --color-primary: #1a73e8;
    --color-primary-dark: #1557b0;
    --color-primary-light: #e8f0fe;
    --color-secondary: #34a853;
    --color-accent: #fbbc04;

    --color-text-primary: #202124;
    --color-text-secondary: #5f6368;
    --color-text-light: #80868b;

    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #e8eaed;

    --color-border: #dadce0;
    --color-shadow: rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;

    /* Layout */
    --container-max-width: 1200px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    line-height: var(--line-height-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

p {
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

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

a:hover {
    color: var(--color-primary-dark);
}

/* ===========================
   Layout Components
   =========================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

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

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    z-index: 1000;
    transition: box-shadow var(--transition-normal);
    text-align: center;
}

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

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-right: 1rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    padding: var(--spacing-3xl) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    animation: fadeInUp 0.6s ease;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.6s ease 0.1s backwards;
    text-align: center;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: var(--line-height-relaxed);
    animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    animation: fadeInUp 0.6s ease 0.3s backwards;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

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

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

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

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

/* ===========================
   About Section
   =========================== */
.about-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
    max-width: 1000px;
    margin: 0 auto;
}

.about-photo {
    position: sticky;
    top: 100px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 4px solid var(--color-bg-primary);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.profile-photo {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover;
    object-position: center 85%;
    transform: scaleX(-1);
    transition: transform var(--transition-normal);
    display: block;
}

.profile-photo:hover {
    transform: scaleX(-1) scale(1.05);
}

.about-text p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

/* Responsive: Stack photo on top for mobile */
@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .about-photo {
        position: static;
        max-width: 350px;
        margin: 0 auto;
    }
}

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

.skill-category {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.skill-category-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
}

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

/* ===========================
   Timeline (Experience)
   =========================== */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: var(--spacing-lg);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
    padding-left: var(--spacing-lg);
}

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 4px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: 3px solid var(--color-bg-secondary);
    transition: all var(--transition-normal);
}

.timeline-item:hover .timeline-marker {
    transform: scale(1.3);
    box-shadow: 0 0 0 4px var(--color-primary-light);
}

.timeline-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.timeline-company {
    font-size: var(--font-size-base);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-sm);
}

.timeline-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.company-desc {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-style: italic;
}

/* ===========================
   Projects Grid
   =========================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.project-card {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    /* cursor: pointer; */
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.project-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.project-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.project-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

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

.tag {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    padding: 4px 12px;
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

/* ===========================
   Contact Section
   =========================== */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.contact-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.contact-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
    max-width: 250px;
    min-width: 180px;
    color: var(--color-text-primary);
}

.contact-link:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    font-size: var(--font-size-xl);
}

/* ===========================
   Footer
   =========================== */
.footer {
    background-color: var(--color-text-primary);
    color: var(--color-bg-secondary);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer p {
    color: var(--color-bg-secondary);
    font-size: var(--font-size-sm);
}

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

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

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 36px;
        --font-size-2xl: 28px;
        --font-size-xl: 20px;
        --spacing-3xl: 64px;
        --spacing-2xl: 48px;
    }

    .navbar .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav-brand {
        margin-right: 0;
        text-align: center;
    }

    .nav-links {
        gap: var(--spacing-md);
        justify-content: center;
    }

    .nav-links a {
        padding: var(--spacing-xs);
        font-size: 13px;
    }

    .hero {
        min-height: 60vh;
        padding: var(--spacing-2xl) 0;
    }

    .hero-cta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .btn {
        width: 100%;
        text-align: center;
    }

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

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

    .timeline {
        padding-left: var(--spacing-md);
    }

    .timeline-item {
        padding-left: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .nav-brand {
        font-size: var(--font-size-base);
    }

    .nav-links {
        gap: var(--spacing-sm);
    }
}

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

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}