/* ===================================
   IVAN PAREDES - PORTFOLIO STYLES
   Modern, Professional Design
   =================================== */

/* CSS Custom Properties */
:root {
    /* Colors */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-secondary: #0ea5e9;
    --color-accent: #10b981;
    
    /* Neutrals */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a24;
    --color-surface: #1e1e2a;
    --color-surface-hover: #252532;
    --color-border: #2a2a3a;
    --color-border-light: #3a3a4a;
    
    /* Text */
    --color-text: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1, #0ea5e9);
    --gradient-hero: linear-gradient(180deg, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    --gradient-card: linear-gradient(180deg, rgba(99, 102, 241, 0.05) 0%, transparent 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===================================
   UTILITIES
   =================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===================================
   NAVIGATION
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: var(--shadow-lg);
}

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

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    transition: var(--transition-fast);
}

.nav-logo:hover {
    color: var(--color-primary-light);
}

.logo-bracket {
    color: var(--color-primary);
}

/* ===================================
   LANGUAGE SWITCHER
   =================================== */

.lang-switcher {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1001;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(30, 30, 42, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
}

.lang-switcher:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
    color: var(--color-text);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.lang-switcher:active {
    transform: translateY(0);
}

.lang-switcher svg {
    width: 18px;
    height: 18px;
    transition: var(--transition-base);
}

.lang-switcher:hover svg {
    color: var(--color-primary-light);
}

.lang-current {
    min-width: 24px;
    text-align: center;
}

@media (max-width: 768px) {
    .lang-switcher {
        top: auto;
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-base);
}

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

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

.nav-cta {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    color: var(--color-text) !important;
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-base);
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
                radial-gradient(circle at 70% 60%, rgba(14, 165, 233, 0.1) 0%, transparent 40%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(5deg); }
    66% { transform: translate(-20px, 20px) rotate(-5deg); }
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xl);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
}

.title-line {
    display: block;
}

.title-line:first-child {
    color: var(--color-text-secondary);
    font-size: 0.5em;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

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

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.hero-description strong {
    color: var(--color-text);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

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

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

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

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

/* Code Window */
.hero-visual {
    display: flex;
    justify-content: center;
}

.code-window {
    width: 100%;
    max-width: 500px;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.window-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border-bottom: 1px solid var(--color-border);
}

.window-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.window-dot.red { background: #ef4444; }
.window-dot.yellow { background: #eab308; }
.window-dot.green { background: #22c55e; }

.window-title {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Code Tabs */
.code-tabs {
    display: flex;
    margin-left: auto;
    gap: 2px;
}

.code-tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    background: transparent;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: var(--transition-fast);
    cursor: pointer;
}

.code-tab:hover {
    color: var(--color-text-secondary);
    background: rgba(255, 255, 255, 0.05);
}

.code-tab.active {
    color: var(--color-text);
    background: var(--color-surface);
}

.tab-icon {
    width: 14px;
    height: 14px;
    border-radius: 2px;
}

.tab-icon.python-icon {
    background: linear-gradient(135deg, #3776ab 50%, #ffd43b 50%);
}

.tab-icon.php-icon {
    background: #777bb3;
}

.code-content {
    padding: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
    overflow-x: auto;
}

.code-content.hidden {
    display: none;
}

.code-variable {
    color: #e06c75;
}

.code-content code {
    display: block;
}

.code-keyword { color: #c678dd; }
.code-class { color: #e5c07b; }
.code-function { color: #61afef; }
.code-param { color: #e06c75; }
.code-string { color: #98c379; }

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-text-muted);
    border-bottom: 2px solid var(--color-text-muted);
    transform: rotate(45deg);
}

/* ===================================
   ABOUT SECTION
   =================================== */

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.about-text {
    color: var(--color-text-secondary);
}

.about-lead {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.about-text p {
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.about-text strong {
    color: var(--color-primary-light);
}

.about-skills h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text);
}

.skills-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.skill-category h4 {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.skill-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.skill-tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-light);
}

/* ===================================
   HIGHLIGHTS SECTION
   =================================== */

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.highlight-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.highlight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition-base);
}

.highlight-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.highlight-card:hover::before {
    transform: scaleX(1);
}

.highlight-card.featured {
    grid-column: span 2;
    background: var(--gradient-card);
}

.highlight-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-lg);
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-lg);
}

.highlight-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

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

.highlight-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Highlight card as link (for repositories) */
.highlight-card-link {
    text-decoration: none;
    cursor: pointer;
    position: relative;
}

.highlight-card-link .highlight-icon.github {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text);
}

.highlight-card-link:hover .highlight-icon.github {
    background: var(--color-text);
    color: var(--color-bg);
}

.highlight-link-indicator {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    color: var(--color-text-muted);
    transition: var(--transition-fast);
}

.highlight-card-link:hover .highlight-link-indicator {
    color: var(--color-primary-light);
    transform: translate(2px, -2px);
}

/* ===================================
   EXPERIENCE SECTION
   =================================== */

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

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    padding-bottom: var(--spacing-3xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: 10px;
    top: 0;
    width: 22px;
    height: 22px;
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 50%;
    z-index: 1;
}

.timeline-marker.current {
    border-color: var(--color-primary);
    background: var(--color-primary);
}

.timeline-marker .pulse {
    position: absolute;
    inset: -4px;
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

.timeline-content {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
}

.timeline-content:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

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

.timeline-info h3 {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.timeline-info .company {
    color: var(--color-primary-light);
    font-weight: 500;
    transition: var(--transition-fast);
}

.timeline-info .company:hover {
    text-decoration: underline;
}

.timeline-date {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    background: var(--color-bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
}

.timeline-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

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

.timeline-achievements li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.timeline-achievements li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary-light);
}

.timeline-achievements a {
    color: var(--color-primary-light);
    font-weight: 500;
    text-decoration: none;
    border-bottom: 1px dashed var(--color-primary-light);
    transition: var(--transition-fast);
}

.timeline-achievements a:hover {
    color: var(--color-primary);
    border-bottom-style: solid;
    border-bottom-color: var(--color-primary);
}

.desc-link a {
    color: var(--color-primary-light);
    font-weight: 500;
    text-decoration: none;
    border-bottom: 1px dashed var(--color-primary-light);
    transition: var(--transition-fast);
}

.desc-link a:hover {
    color: var(--color-primary);
    border-bottom-style: solid;
    border-bottom-color: var(--color-primary);
}

.timeline-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.timeline-tech span {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* ===================================
   CERTIFICATIONS SECTION
   =================================== */

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.cert-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: var(--transition-base);
}

.cert-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.cert-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-xl);
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-lg);
}

.cert-badge.php {
    background: rgba(119, 123, 180, 0.1);
    color: #777bb4;
}

.cert-badge.ai {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-accent);
}

.cert-badge.data-science {
    background: rgba(14, 165, 233, 0.1);
    color: var(--color-secondary);
}

.cert-badge.microsoft {
    background: rgba(0, 120, 212, 0.1);
    color: #0078d4;
}

.cert-info h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.cert-issuer {
    font-size: 0.875rem;
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-md);
}

.cert-description {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
}

.cert-skills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.cert-skills span {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.cert-verified {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-accent);
    font-size: 0.875rem;
    font-weight: 500;
}

.cert-preview-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.cert-preview-btn:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text);
}

/* Certificate Modal */
.cert-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
}

.cert-modal.active {
    opacity: 1;
    visibility: visible;
}

.cert-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
}

.cert-modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    transform: scale(0.9);
    transition: var(--transition-base);
}

.cert-modal.active .cert-modal-content {
    transform: scale(1);
}

.cert-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: transparent;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    padding: var(--spacing-sm);
    transition: var(--transition-fast);
}

.cert-modal-close:hover {
    color: var(--color-primary-light);
    transform: scale(1.1);
}

.cert-modal-image {
    max-width: 100%;
    max-height: 85vh;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

/* ===================================
   FOOTER / CTA SECTION
   =================================== */

.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-cta {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

.footer-cta h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-cta p {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-2xl);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.btn-cta.github {
    background: #24292e;
    color: var(--color-text);
    border: 1px solid #30363d;
}

.btn-cta.github:hover {
    background: #30363d;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.btn-cta.linkedin {
    background: #0077b5;
    color: var(--color-text);
}

.btn-cta.linkedin:hover {
    background: #005885;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 119, 181, 0.3);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

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

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-badge {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .highlight-card.featured {
        grid-column: span 2;
    }
    
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--color-bg);
        flex-direction: column;
        justify-content: center;
        gap: var(--spacing-xl);
        transition: var(--transition-base);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .highlights-grid {
        grid-template-columns: 1fr;
    }
    
    .highlight-card.featured {
        grid-column: span 1;
    }
    
    .certifications-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 10px;
    }
    
    .timeline-item {
        padding-left: 40px;
    }
    
    .timeline-marker {
        left: 0;
        width: 20px;
        height: 20px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: center;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-cta {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ===================================
   ANIMATIONS ON SCROLL
   =================================== */

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}