/* =============================================
   PORTFOLIO STYLESHEET - Rojan Jafarnezhad
   Professional, clean design with subtle animations
   ============================================= */

/* =============================================
   CSS VARIABLES & THEMING
   ============================================= */
:root {
    /* Colors - Professional palette */
    --color-bg: #0f0f0f;
    --color-bg-secondary: #1a1a1a;
    --color-bg-tertiary: #242424;
    --color-text: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #707070;
    --color-accent: #00d4aa;
    --color-accent-dark: #00a685;
    --color-border: #2a2a2a;
    --color-code-bg: #1e1e1e;
    
    /* Typography */
    --font-display: 'Archivo', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Archivo', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Layout */
    --container-width: 1200px;
    --nav-height: 70px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* =============================================
   RESET & BASE STYLES
   ============================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =============================================
   TYPOGRAPHY
   ============================================= */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: 1rem;
}

h1 { font-size: 3.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; letter-spacing: -0.01em; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }

p {
    margin-bottom: 1.25rem;
    color: var(--color-text-secondary);
}

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

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

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--color-code-bg);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    color: var(--color-accent);
}

ul {
    list-style-position: outside;
    margin-left: 1.5rem;
}

strong {
    font-weight: 600;
    color: var(--color-text);
}

/* =============================================
   LAYOUT CONTAINERS
   ============================================= */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

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

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 60%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
}

.section-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
}

/* =============================================
   NAVIGATION
   ============================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(15, 15, 15, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-normal);
}

.navbar.scrolled {
    background-color: rgba(15, 15, 15, 0.95);
}

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

.nav-brand {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: -0.05em;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
    list-style: none;
    margin: 0;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* =============================================
   HERO SECTION
   ============================================= */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    position: relative;
    margin-top: var(--nav-height);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(0, 212, 170, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 170, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.5;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-size: 5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.hero-meta {
    font-size: 1rem;
    color: var(--color-text-muted);
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
}

.separator {
    color: var(--color-accent);
}

/* =============================================
   PROFILE SECTION
   ============================================= */
.profile-section {
    background-color: var(--color-bg);
}

.profile-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.profile-image {
    width: 250px;
    height: 250px;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid var(--color-border);
    margin: 0 auto var(--spacing-md);
}

.profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-text {
    max-width: 900px;
}

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

/* =============================================
   RESUME SECTION
   ============================================= */
.resume-section {
    background-color: var(--color-bg-secondary);
}

.resume-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.resume-name {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.contact-info {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

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

.resume-block-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.resume-item {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    border-left: 3px solid var(--color-accent);
    transition: transform var(--transition-normal);
}

.resume-item:hover {
    transform: translateX(5px);
}

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

.resume-item h4 {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.company {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.resume-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.resume-detail {
    margin-bottom: 0.75rem;
    color: var(--color-text-secondary);
}

.resume-list {
    list-style-type: none;
    margin-left: 0;
}

.resume-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--color-text-secondary);
}

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

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.skill-category {
    background-color: var(--color-bg-tertiary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.skill-category h5 {
    color: var(--color-accent);
    margin-bottom: 0.75rem;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skill-category p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

.resume-download {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

/* =============================================
   WORK SAMPLES SECTION
   ============================================= */
.work-section {
    background-color: var(--color-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.project-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 212, 170, 0.1);
}

.project-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
}

.project-title {
    font-size: 1.5rem;
    margin: 0;
    flex: 1 1 100%;
}

.project-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-bg-tertiary);
    color: var(--color-accent);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    border: 1px solid var(--color-accent);
}

.project-body {
    padding: var(--spacing-md);
}

.project-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.project-tech,
.project-highlights {
    margin-bottom: var(--spacing-md);
}

.project-tech strong,
.project-highlights strong {
    color: var(--color-text);
    display: block;
    margin-bottom: 0.5rem;
}

.project-highlights ul {
    margin-top: 0.5rem;
}

.project-highlights li {
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
}

.project-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.project-note {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-top: var(--spacing-sm);
}

.github-section {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.github-section h3 {
    margin-bottom: 1rem;
}

.github-section p {
    max-width: 600px;
    margin: 0 auto 1.5rem;
}

/* =============================================
   EDUCATION SECTION
   ============================================= */
.education-section {
    background-color: var(--color-bg-secondary);
}

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

.credentials-title {
    font-size: 1.75rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.credential-item {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    border-left: 3px solid var(--color-accent);
}

.credential-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    gap: 1rem;
}

.credential-header h4 {
    margin: 0;
}

.credential-status {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    white-space: nowrap;
}

.credential-institution {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.credential-details p {
    margin-bottom: 0.5rem;
}

.credential-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* Achievement Grid */
.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.achievement-card {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    text-align: center;
    transition: transform var(--transition-normal);
}

.achievement-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
}

.achievement-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.achievement-card h4 {
    margin-bottom: 0.5rem;
}

.achievement-term {
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.achievement-description {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* Certificate Grid */
.certificate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.certificate-item {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.certificate-item h4 {
    margin-bottom: 0.5rem;
}

.certificate-issuer {
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
}

.certificate-date {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Participation List */
.participation-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.participation-item {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 3px solid var(--color-accent);
}

.participation-item h4 {
    margin-bottom: 0.5rem;
}

.participation-location {
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
}

.participation-role {
    margin-bottom: 1rem;
}

.participation-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* Placeholder Messages */
.placeholder-message {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px dashed var(--color-border);
}

.placeholder-message p {
    margin-bottom: 0.75rem;
}

.placeholder-message ul {
    color: var(--color-text-secondary);
}

/* =============================================
   BUTTONS
   ============================================= */
.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid var(--color-accent);
}

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

.btn-primary:hover {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 212, 170, 0.3);
}

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

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

/* Recommendation List */
.recommendation-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.recommendation-item {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 3px solid var(--color-accent);
}

.recommendation-item h4 {
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.recommendation-title {
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.recommendation-context {
    color: var(--color-text-secondary);
    font-style: italic;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.recommendation-excerpt {
    color: var(--color-text-secondary);
    line-height: 1.8;
    font-style: italic;
    padding: 1rem;
    background-color: var(--color-bg);
    border-left: 2px solid var(--color-border);
    margin-bottom: 1rem;
    border-radius: 4px;
}

.recommendation-excerpt::before {
    content: '"';
    font-size: 2rem;
    color: var(--color-accent);
    line-height: 0;
    margin-right: 0.25rem;
}

.recommendation-excerpt::after {
    content: '"';
    font-size: 2rem;
    color: var(--color-accent);
    line-height: 0;
    margin-left: 0.25rem;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

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

.footer-content p {
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.footer-note {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 1rem;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

/* =============================================
   UTILITIES
   ============================================= */
.note {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
}

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

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */
@media (max-width: 968px) {
    html {
        font-size: 15px;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .nav-menu {
        gap: 1.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 1.5rem;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .nav-menu {
        gap: 1rem;
        font-size: 0.85rem;
    }
    
    .resume-item-header,
    .credential-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .achievement-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-brand {
        font-size: 1.25rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }
}