/* Minimalist Portfolio Redesign */

:root {
    /* Colors - Optimized Palette */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f7;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --accent: #667eea;
    --accent-light: #8b9ff5;
    --accent-dark: #5568d3;
    --border: #e8e8ed;
    --white: #ffffff;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html.dark-theme body,
body.dark-theme {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #1a1a1a;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #86868b;
    --accent: #8b9ff5;
    --accent-light: #a8b8f7;
    --accent-dark: #7086f0;
    --border: #2d2d2d;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 1000;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: var(--transition);
    color: var(--text-secondary);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: scale(1.05);
}

/* Navigation */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

html.dark-theme .nav,
body.dark-theme .nav {
    background: rgba(0, 0, 0, 0.8);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    transition: var(--transition);
}

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

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: var(--accent);
    color: var(--white);
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    transition: var(--transition);
}

.nav-cta:hover {
    background: var(--accent-dark);
    transform: translateY(-1px);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    font-size: 1.25rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--space-xs);
    transition: var(--transition);
}

.mobile-menu-toggle:hover {
    color: var(--accent);
}

/* Hero Section */
.hero {
    padding: var(--space-3xl) 0;
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
}

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

.hero-label {
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 3vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    font-weight: var(--font-weight-normal);
    line-height: 1.5;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    margin-bottom: var(--space-2xl);
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-xl);
    border-radius: 30px;
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

/* Sections */
.section {
    padding: var(--space-3xl) 0;
}

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

.section-label {
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-xl);
    line-height: 1.2;
}

/* About Section */
.about-content {
    max-width: 700px;
    margin: 0 auto;
}

.lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    line-height: 1.7;
}

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

.about-col h3 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.about-col p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: var(--space-xl);
}

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

.timeline-item {
    position: relative;
    margin-bottom: var(--space-2xl);
}

.timeline-marker {
    position: absolute;
    left: -26px;
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-primary);
}

.section-alt .timeline-marker {
    border-color: var(--bg-secondary);
}

.timeline-content {
    padding-bottom: var(--space-lg);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.timeline-content h3 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-xs);
}

.company {
    color: var(--accent);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-xs);
}

.timeline-date {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
}

.timeline-content > p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.7;
}

.achievement-list {
    list-style: none;
    margin-top: var(--space-md);
}

.achievement-list li {
    color: var(--text-secondary);
    padding-left: var(--space-md);
    margin-bottom: var(--space-sm);
    position: relative;
    line-height: 1.7;
}

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

/* Projects */
.project-category {
    margin-bottom: var(--space-3xl);
}

.category-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: var(--space-xl);
    transition: var(--transition);
}

.section-alt .project-card {
    background: var(--bg-primary);
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

.project-card.highlight {
    border-color: var(--accent);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(102, 126, 234, 0.02));
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
    gap: var(--space-md);
}

.project-header h4 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    line-height: 1.3;
}

.project-badge {
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    color: var(--accent);
    background: rgba(102, 126, 234, 0.1);
    padding: 4px 12px;
    border-radius: 12px;
    white-space: nowrap;
}

.project-card > p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.7;
}

.project-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.project-features span {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.project-features i {
    color: var(--accent);
    font-size: 0.75rem;
}

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

.project-tags span {
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 4px 12px;
    border-radius: 12px;
}

.section-alt .project-tags span {
    background: var(--bg-secondary);
}

/* Skills */
.skills-minimal {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-2xl);
}

.skill-group h3 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-md);
}

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

.skill-tags span {
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    background: var(--bg-primary);
    padding: var(--space-xs) var(--space-md);
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.skill-tags span:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Education */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.education-card {
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
}

.section-alt .education-card {
    background: var(--bg-primary);
}

.education-card h3 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-md);
}

.education-detail {
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.cert-list-minimal {
    list-style: none;
}

.cert-list-minimal li {
    color: var(--text-secondary);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--border);
    line-height: 1.6;
}

.cert-list-minimal li:last-child {
    border-bottom: none;
}

/* Contact */
.contact-content {
    max-width: 700px;
    margin: 0 auto;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.contact-link:hover {
    border-color: var(--accent);
}

.contact-link i {
    color: var(--accent);
    font-size: 1.25rem;
}

.contact-form-minimal {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.form-field {
    min-width: 0;
}

.contact-form-minimal input,
.contact-form-minimal textarea {
    width: 100%;
    padding: var(--space-md);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
}

.contact-form-minimal input:focus,
.contact-form-minimal textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.contact-form-minimal textarea {
    resize: vertical;
}

#form-status {
    font-size: 0.875rem;
    margin-top: var(--space-sm);
    text-align: center;
}

/* Footer */
.footer {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: var(--space-md);
}

.footer-links a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Scroll animations - only hide content when JS is available */
.js-animations .section,
.js-animations .timeline-item,
.js-animations .project-card {
    opacity: 0;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    z-index: 1000;
    background: var(--accent);
    color: var(--white);
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-content {
        position: relative;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--bg-primary);
        border: 1px solid var(--border);
        border-top: none;
        padding: var(--space-md) 0;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    html.dark-theme .nav-links,
    body.dark-theme .nav-links {
        background: var(--bg-secondary);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        padding: var(--space-md) var(--space-lg);
        border-bottom: 1px solid var(--border);
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .theme-toggle {
        top: var(--space-md);
        left: var(--space-md);
        right: auto;
    }

    .hero {
        padding: var(--space-2xl) 0;
    }

    .hero-stats {
        gap: var(--space-xl);
    }

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

    .timeline {
        padding-left: var(--space-lg);
    }

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

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

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }

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

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