/* ========================================
   Alessandro Ferraiolo — Portfolio Styles
   Minimal, tech-elegant, blue theme
   ======================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
    --color-primary: #0A1628;
    --color-primary-light: #0f2240;
    --color-accent: #2563EB;
    --color-accent-hover: #1d4ed8;
    --color-accent-light: #60A5FA;
    --color-accent-pale: #DBEAFE;
    --color-bg: #F8FAFC;
    --color-bg-white: #FFFFFF;
    --color-text: #1E293B;
    --color-text-light: #64748B;
    --color-text-inverse: #F1F5F9;
    --color-border: #E2E8F0;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-hero: 3.5rem;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    --space-section: 6rem;

    --max-width: 1200px;
    --container-padding: 1.5rem;
    --nav-height: 70px;

    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-nav: 0 1px 3px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-full: 50%;
    --transition: 0.3s ease;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + 20px);
}

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

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

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

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

ul {
    list-style: none;
}

/* ---------- Skip Link ---------- */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-accent);
    color: #fff;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-sm);
    z-index: 10000;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 10px;
    color: #fff;
}

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

section {
    padding: var(--space-section) 0;
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-xl);
    color: var(--color-text);
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-accent);
    margin-top: var(--space-sm);
    border-radius: 2px;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
}

.subsection-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    transition: background-color var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    background-color: var(--color-bg-white);
    box-shadow: var(--shadow-nav);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.navbar.scrolled .nav-logo {
    color: var(--color-text);
}

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

.nav-links a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition);
    padding: 0.25rem 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-light);
    transition: width var(--transition);
}

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

.nav-links a:hover {
    color: #fff;
}

.navbar.scrolled .nav-links a {
    color: var(--color-text-light);
}

.navbar.scrolled .nav-links a:hover,
.navbar.scrolled .nav-links a.active {
    color: var(--color-accent);
}

.navbar.scrolled .nav-links a::after {
    background: var(--color-accent);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
    background: var(--color-accent);
    color: #fff !important;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: var(--font-size-sm);
    letter-spacing: 0.02em;
    transition: background-color var(--transition) !important;
}

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

.nav-cta:hover {
    background: var(--color-accent-hover);
    color: #fff !important;
}

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-inverse);
    border-radius: 2px;
    transition: var(--transition);
}

.navbar.scrolled .hamburger-line {
    background: var(--color-text);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
    min-height: 100vh;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
    overflow: hidden;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: var(--space-2xl);
}

.hero-text {
    flex: 1;
}

.hero-greeting {
    font-size: var(--font-size-lg);
    color: var(--color-accent-light);
    font-weight: 400;
    margin-bottom: var(--space-xs);
}

.hero-name {
    font-size: var(--font-size-hero);
    font-weight: 700;
    color: var(--color-text-inverse);
    line-height: 1.1;
    margin-bottom: var(--space-sm);
}

.hero-tagline {
    font-size: var(--font-size-lg);
    color: var(--color-accent-light);
    font-weight: 500;
    margin-bottom: var(--space-md);
}

.hero-intro {
    font-size: var(--font-size-base);
    color: rgba(241, 245, 249, 0.75);
    max-width: 500px;
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.hero-social {
    display: flex;
    gap: var(--space-md);
}

.hero-social a {
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition), transform var(--transition);
}

.hero-social a:hover {
    color: var(--color-accent-light);
    transform: translateY(-2px);
}

.hero-image {
    flex-shrink: 0;
}

.hero-image-wrapper {
    width: 380px;
    height: 380px;
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 4px solid rgba(96, 165, 250, 0.3);
    box-shadow: 0 0 60px rgba(37, 99, 235, 0.2);
}

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

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

.btn-secondary:hover {
    background: var(--color-accent-light);
    color: var(--color-primary);
    transform: translateY(-1px);
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-accent);
    background: var(--color-accent-pale);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    margin-top: var(--space-sm);
    transition: all var(--transition);
}

.btn-download:hover {
    background: var(--color-accent);
    color: #fff;
}

.btn-download-sm {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-accent);
    padding: 0.35rem 0;
    transition: all var(--transition);
}

.btn-download-sm:hover {
    color: var(--color-accent-hover);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: var(--font-size-base);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about {
    background: var(--color-bg-white);
}

.about-content {
    display: grid;
    gap: var(--space-xl);
}

.about-narrative p {
    margin-bottom: var(--space-md);
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-text);
}

.about-narrative p:last-child {
    margin-bottom: 0;
}

.about-highlights {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.highlight-card {
    flex: 1;
    min-width: 160px;
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.highlight-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1.2;
}

.highlight-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: var(--space-xs);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--color-border);
}

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

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

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--space-xl) + 2px);
    top: 8px;
    width: 14px;
    height: 14px;
    border-radius: var(--radius-full);
    background: var(--color-accent);
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-content {
    background: var(--color-bg-white);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-border);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}
.timeline-meta {
    text-align: right;
    flex-shrink: 0;
}
.timeline-location {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}
.timeline-date {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 0.02em;
}

.timeline-details {
    list-style: none;
    padding: 0;
    margin: var(--space-sm) 0;
}
.timeline-details li {
    position: relative;
    padding-left: 1.2rem;
    font-size: var(--font-size-sm);
    color: var(--color-text);
    margin-bottom: 0.5rem;
    line-height: 1.6;
}
.timeline-details li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}

.timeline-badge {
    display: inline-block;
    background: var(--color-accent);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.2rem 0.6rem;
    border-radius: 100px;
    margin-top: 0.25rem;
}

@media (max-width: 768px) {
    .timeline-header {
        flex-direction: column;
        gap: 0.25rem;
    }
    .timeline-meta {
        text-align: left;
    }
}

.highschool-activities {
    margin-top: var(--space-sm);
}

.activities-label {
    font-size: var(--font-size-sm);
    margin-bottom: 0.4rem;
}

.activities-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.activities-list li {
    position: relative;
    padding-left: 1.2rem;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: 0.3rem;
    line-height: 1.5;
}

.activities-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent-light);
}

.timeline-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-top: var(--space-xs);
    margin-bottom: 0.25rem;
}

.timeline-institution {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.timeline-content p {
    color: var(--color-text);
    line-height: 1.7;
}

/* ============================================================
   EXPERIENCE
   ============================================================ */
.experience {
    background: var(--color-bg-white);
}

.experience-card {
    background: var(--color-bg);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-accent);
    margin-bottom: var(--space-xl);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}
.experience-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
}
.experience-header h3 a {
    color: inherit;
    text-decoration: none;
}
.experience-header h3 a:hover {
    color: var(--color-accent);
}
.experience-meta {
    text-align: right;
    flex-shrink: 0;
}
.experience-location {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}
.experience-role {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    font-weight: 500;
    font-style: italic;
    margin-top: 0.25rem;
}
.experience-date {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
}
.experience-details {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-md) 0;
}
.experience-details li {
    position: relative;
    padding-left: 1.2rem;
    font-size: var(--font-size-sm);
    color: var(--color-text);
    margin-bottom: 0.75rem;
    line-height: 1.7;
}
.experience-details li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}
.experience-image {
    margin-top: var(--space-md);
    border-radius: var(--radius-md);
    overflow: hidden;
}
.experience-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
}

@media (max-width: 768px) {
    .experience-header {
        flex-direction: column;
        gap: 0.25rem;
    }
    .experience-meta {
        text-align: left;
    }
}

.metric-value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-accent);
}

.metric-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: 0.25rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--space-sm);
}

.tech-tag {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.3rem 0.75rem;
    background: var(--color-accent-pale);
    color: var(--color-accent);
    border-radius: 100px;
}

/* Video */
.video-section {
    margin-top: var(--space-lg);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card-hover);
    background: #000;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.video-caption {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: var(--space-sm);
    font-style: italic;
}

/* ============================================================
   PROJECTS
   ============================================================ */
.project-featured {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    background: var(--color-bg-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-xl);
}

.project-featured-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.project-role {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.project-role a {
    font-weight: 600;
}

.project-featured-content p {
    line-height: 1.8;
}

.project-featured-image {
    border-radius: var(--radius-md);
    overflow: hidden;
}

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

.project-card {
    background: var(--color-bg-white);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-xl);
    transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

.project-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.project-lang {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: var(--color-text-light);
}

.projects-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}
.projects-list .project-card {
    margin-bottom: 0;
}
@media (max-width: 768px) {
    .projects-list {
        grid-template-columns: 1fr;
    }
}

.project-highlight {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.project-card > p:last-of-type {
    line-height: 1.8;
}

.technical-projects {
    margin-top: var(--space-lg);
}

.technical-projects-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.technical-projects-image {
    border-radius: var(--radius-md);
    overflow: hidden;
    position: sticky;
    top: calc(var(--nav-height) + 20px);
}

.technical-projects-image img {
    width: 100%;
    border-radius: var(--radius-md);
}

.image-caption {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: var(--space-sm);
    font-style: italic;
    text-align: center;
}

.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.project-mini-card {
    background: var(--color-bg-white);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-border);
    transition: transform var(--transition), box-shadow var(--transition);
}

.project-mini-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

.project-mini-card h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.project-mini-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: var(--space-sm);
}

/* Google Photo */
.google-photo {
    margin-top: var(--space-lg);
    text-align: center;
}

.google-photo img {
    width: 100%;
    max-width: 600px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.google-photo .image-caption {
    margin-top: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

/* ============================================================
   VOLUNTEERING
   ============================================================ */
.volunteering {
    background: var(--color-bg-white);
}

/* B4i Stages (inside experience card) */
.b4i-stages {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}
.b4i-heading {
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}
.b4i-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}
.b4i-stage {
    padding: var(--space-md);
    background: var(--color-bg-white);
    border-radius: 8px;
    border-left: 3px solid var(--color-accent);
}
.b4i-stage h5 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}
.b4i-date {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    display: block;
    margin-bottom: 0.5rem;
}
.b4i-stage p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.5;
}
@media (max-width: 768px) {
    .b4i-grid {
        grid-template-columns: 1fr;
    }
}

/* Timeline courses */
.timeline-courses {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: 0.5rem;
}

/* ============================================================
   SKILLS
   ============================================================ */
.skills {
    background: var(--color-bg-white);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-lg);
}

.skill-category {
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.skill-category h4 {
    font-size: var(--font-size-base);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.35rem 0.85rem;
    border-radius: 100px;
}

.skill-tag.advanced {
    background: var(--color-accent);
    color: #fff;
}

.skill-tag.intermediate {
    background: var(--color-accent-pale);
    color: var(--color-accent);
}

.skill-certs {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
}

.cert-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-accent);
    transition: color var(--transition);
}

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

/* ============================================================
   LANGUAGES
   ============================================================ */
.languages-grid {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.language-card {
    flex: 1;
    min-width: 250px;
    background: var(--color-bg-white);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-border);
}

.language-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.language-header h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.language-level {
    font-size: var(--font-size-sm);
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
}

.language-level.native {
    background: var(--color-accent);
    color: #fff;
}

.language-level.advanced {
    background: var(--color-accent-pale);
    color: var(--color-accent);
}

.language-level.beginner {
    background: #F1F5F9;
    color: var(--color-text-light);
}

.language-certs {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
}

/* ============================================================
   CERTIFICATES
   ============================================================ */
.certificates {
    background: var(--color-bg-white);
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-md);
}

.cert-card {
    background: var(--color-bg);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition), box-shadow var(--transition);
}

.cert-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

.cert-icon {
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.cert-card h4 {
    font-size: var(--font-size-base);
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.cert-detail {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

/* ============================================================
   EXPLORE (Search Engine)
   ============================================================ */
.explore {
    background: var(--color-bg-white);
}

.explore-search {
    margin-bottom: var(--space-lg);
}

.search-input-wrapper {
    position: relative;
    max-width: 600px;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-light);
    pointer-events: none;
}

#explore-search {
    width: 100%;
    padding: 0.9rem 2.75rem 0.9rem 2.75rem;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition), box-shadow var(--transition);
}

#explore-search:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

#explore-search::placeholder {
    color: var(--color-text-light);
}

.search-clear {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition);
}

.search-clear:hover {
    color: var(--color-text);
}

.search-results-count {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: 0.5rem;
    min-height: 1.2em;
}

/* Category Filters */
.explore-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--space-xl);
}

.filter-btn {
    font-family: var(--font-family);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.4rem 0.9rem;
    border: 1.5px solid var(--color-border);
    border-radius: 100px;
    background: var(--color-bg);
    color: var(--color-text-light);
    cursor: pointer;
    transition: all var(--transition);
}

.filter-btn:hover {
    border-color: var(--color-accent-light);
    color: var(--color-accent);
}

.filter-btn.active {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

/* Sort Toggle */
.explore-sort {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
}

.explore-sort label {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    font-weight: 500;
}

.explore-sort select {
    font-family: inherit;
    font-size: var(--font-size-sm);
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-white);
    color: var(--color-text);
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.explore-sort select:focus {
    border-color: var(--color-accent);
}

/* Explore Cards Grid */
.explore-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-md);
}

.explore-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.explore-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-accent-light);
}

.explore-card-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.explore-card h4 {
    font-size: var(--font-size-base);
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
    line-height: 1.4;
}

.explore-card-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: var(--space-sm);
    flex: 1;
}

.explore-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-top: auto;
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
}

.explore-card-lang {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-light);
}

.explore-card-actions {
    display: flex;
    gap: 0.5rem;
}

.explore-card-btn {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    transition: color var(--transition);
}

.explore-card-btn:hover {
    color: var(--color-accent-hover);
}

/* No results */
.explore-no-results {
    text-align: center;
    padding: var(--space-2xl) 0;
    color: var(--color-text-light);
}

.explore-no-results svg {
    margin-bottom: var(--space-sm);
    opacity: 0.3;
}

.explore-no-results p {
    font-size: var(--font-size-lg);
}

/* Search highlight */
.search-highlight {
    background: var(--color-accent-pale);
    color: var(--color-accent);
    padding: 0 0.15em;
    border-radius: 2px;
}

/* ============================================================
   PROJECT MODAL
   ============================================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 22, 40, 0.7);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.modal-content {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    padding: var(--space-xl);
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-light);
    transition: all var(--transition);
    z-index: 1;
}

.modal-close:hover {
    color: var(--color-text);
    background: var(--color-border);
}

.modal-header {
    margin-bottom: var(--space-lg);
    padding-right: var(--space-xl);
}

.modal-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    display: inline-block;
    margin-bottom: 0.5rem;
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.modal-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.modal-body {
    line-height: 1.8;
    color: var(--color-text);
}

.modal-body h3 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-top: var(--space-lg);
    margin-bottom: 0.5rem;
}

.modal-body p {
    margin-bottom: var(--space-sm);
}

.modal-body ul {
    list-style: disc;
    padding-left: 1.5rem;
    margin-bottom: var(--space-sm);
}

.modal-body li {
    margin-bottom: 0.35rem;
    line-height: 1.7;
}

.modal-body strong {
    font-weight: 600;
}

.modal-body em {
    font-style: italic;
}

.modal-body code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85em;
    background: var(--color-bg);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    color: var(--color-accent);
}

.modal-body table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-sm) 0;
    font-size: var(--font-size-sm);
}

.modal-body th,
.modal-body td {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    text-align: left;
}

.modal-body th {
    background: var(--color-bg);
    font-weight: 600;
}

.modal-footer {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.modal-footer a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

body.modal-open {
    overflow: hidden;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact {
    text-align: center;
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.contact .section-title {
    color: var(--color-text-inverse);
}

.contact .section-title::after {
    margin-left: auto;
    margin-right: auto;
}

.contact .section-subtitle {
    color: rgba(241, 245, 249, 0.7);
    margin: 0 auto var(--space-xl);
}

.contact-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-inverse);
    font-size: var(--font-size-lg);
    font-weight: 500;
    transition: color var(--transition);
}

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

.contact-social {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.contact-social .btn-secondary {
    color: var(--color-text-inverse);
    border-color: rgba(255, 255, 255, 0.3);
}

.contact-social .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    color: #fff;
}

.contact-cv {
    margin-top: var(--space-sm);
}

/* ============================================================
   PDF PREVIEW MODAL
   ============================================================ */
.pdf-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 22, 40, 0.85);
    backdrop-filter: blur(4px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}
.pdf-modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}
.pdf-modal-content {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    width: 90vw;
    max-width: 900px;
    height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
    transform: scale(0.95) translateY(10px);
    transition: transform 0.25s ease;
    overflow: hidden;
}
.pdf-modal-overlay.active .pdf-modal-content {
    transform: scale(1) translateY(0);
}
.pdf-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    gap: 1rem;
}
.pdf-modal-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.pdf-modal-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}
.pdf-modal-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-light);
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
    display: flex;
}
.pdf-modal-close:hover {
    color: var(--color-text);
    background: rgba(0, 0, 0, 0.05);
}
.pdf-modal-body {
    flex: 1;
    overflow: hidden;
}
.pdf-modal-body iframe {
    width: 100%;
    height: 100%;
    border: none;
}
.pdf-modal-fallback {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 1rem;
    color: var(--color-text-light);
    text-align: center;
    padding: 2rem;
}

/* Preview button styling */
.btn-preview-sm {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    background: transparent;
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-preview-sm:hover {
    background: var(--color-accent);
    color: #fff;
}

@media (max-width: 768px) {
    .pdf-modal-content {
        width: 95vw;
        height: 80vh;
    }
    .pdf-modal-header {
        padding: 0.75rem 1rem;
    }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    background: var(--color-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: var(--space-lg) 0;
    text-align: center;
}

.footer p {
    font-size: var(--font-size-sm);
    color: rgba(241, 245, 249, 0.4);
}

/* ============================================================
   SCROLL REVEAL ANIMATIONS
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-stagger > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.08s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.16s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.24s; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.32s; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.40s; }
.reveal-stagger.visible > *:nth-child(7) { transition-delay: 0.48s; }
.reveal-stagger.visible > *:nth-child(8) { transition-delay: 0.56s; }
.reveal-stagger.visible > *:nth-child(9) { transition-delay: 0.64s; }

.reveal-stagger.visible > * {
    opacity: 1;
    transform: translateY(0);
}

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

/* ------- Mobile (< 768px) ------- */
@media (max-width: 767px) {
    :root {
        --font-size-hero: 2.5rem;
        --font-size-2xl: 1.75rem;
        --font-size-3xl: 2rem;
        --space-section: 4rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: calc(var(--nav-height) + 1rem) var(--space-lg) var(--space-lg);
        gap: 0;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.15);
        transition: right var(--transition);
        overflow-y: auto;
    }

    .nav-links.open {
        right: 0;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        color: var(--color-text) !important;
        display: block;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--color-border);
        font-size: var(--font-size-base);
    }

    .nav-links a::after {
        display: none;
    }

    .nav-cta {
        margin-top: var(--space-sm);
        justify-content: center;
    }

    body.menu-open {
        overflow: hidden;
    }

    /* Hero */
    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
        gap: var(--space-lg);
        padding-top: var(--space-lg);
        padding-bottom: var(--space-lg);
    }

    .hero-image-wrapper {
        width: 220px;
        height: 220px;
    }

    .hero-intro {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-social {
        justify-content: center;
    }

    /* About */
    .about-highlights {
        flex-direction: column;
    }

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

    /* Experience */
    .experience-metrics {
        flex-direction: column;
    }

    /* Projects */
    .project-featured {
        grid-template-columns: 1fr;
    }

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

    .technical-projects-image {
        position: static;
    }

    /* Skills */
    .skills-grid {
        grid-template-columns: 1fr;
    }

    /* Languages */
    .languages-grid {
        flex-direction: column;
    }

    /* Certificates */
    .certificates-grid {
        grid-template-columns: 1fr;
    }

    /* Contact */
    .contact-social {
        flex-direction: column;
        align-items: center;
    }

    /* Explore */
    .explore-grid {
        grid-template-columns: 1fr;
    }

    .explore-filters {
        gap: 0.35rem;
    }

    .filter-btn {
        font-size: 0.7rem;
        padding: 0.3rem 0.7rem;
    }

    /* Modal */
    .modal-overlay {
        padding: 0;
        align-items: flex-end;
    }

    .modal-content {
        max-height: 92vh;
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        padding: var(--space-lg);
    }
}

/* ------- Tablet (768px - 1023px) ------- */
@media (min-width: 768px) and (max-width: 1023px) {
    :root {
        --font-size-hero: 3rem;
        --container-padding: 2rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--color-bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: calc(var(--nav-height) + 1rem) var(--space-lg) var(--space-lg);
        gap: 0;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.15);
        transition: right var(--transition);
        overflow-y: auto;
    }

    .nav-links.open {
        right: 0;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        color: var(--color-text) !important;
        display: block;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links a::after {
        display: none;
    }

    body.menu-open {
        overflow: hidden;
    }

    .hero-image-wrapper {
        width: 300px;
        height: 300px;
    }

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

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

    .technical-projects-image {
        position: static;
    }

    .certificates-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ------- Desktop (>= 1024px) ------- */
@media (min-width: 1024px) {
    :root {
        --container-padding: 2rem;
    }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .reveal,
    .reveal-stagger > * {
        opacity: 1;
        transform: none;
        transition: none;
    }

    * {
        transition-duration: 0.01ms !important;
    }
}

/* ---------- Focus Styles ---------- */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 2px;
}