/* ========================================
   YVENS CHARLES PORTFOLIO - MODERN DESIGN
   ======================================== */

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --accent: #06b6d4;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray-900: #111827;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, sans-serif;
    line-height: 1.7;
    color: var(--gray-600);
    background: var(--gray-50);
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* HEADER */
header {
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
}
.nav-container { display: flex; justify-content: space-between; align-items: center; height: 72px; }
.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 8px; }
.nav-links a { font-weight: 500; padding: 10px 20px; border-radius: var(--radius); color: var(--gray-600); }
.nav-links a:hover, .nav-links a.active { color: var(--primary); background: rgba(99,102,241,0.1); }
/* HERO */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    background: var(--dark);
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%; right: -20%;
    width: 80%; height: 150%;
    background: radial-gradient(ellipse at center, rgba(99,102,241,0.15) 0%, transparent 70%);
}
.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}
.hero-text { color: var(--white); }
.hero-text h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}
.subtitle { font-size: 1.25rem; color: var(--gray-400); margin-bottom: 16px; }
.intro-description { font-size: 1.1rem; color: var(--gray-400); margin-bottom: 40px; max-width: 500px; }
.intro-description strong { color: var(--white); font-weight: 600; }
.hero-image img {
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl), 0 0 40px rgba(99,102,241,0.3);
    aspect-ratio: 1;
    object-fit: cover;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}
.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(99,102,241,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(99,102,241,0.5); }
.btn-outline { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.3); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.5); }
.btn-dark { background: var(--dark); color: var(--white); }
.btn-dark:hover { background: var(--dark-light); transform: translateY(-2px); }

/* SECTIONS */
section { padding: 100px 0; }
h2 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 48px;
    text-align: center;
}

/* ABOUT */
.about-section { background: var(--white); }
.text-block { max-width: 800px; margin: 0 auto; text-align: center; }
.text-block p { font-size: 1.2rem; color: var(--gray-600); line-height: 1.9; margin-bottom: 24px; }
.text-block strong { color: var(--primary); font-weight: 600; }
.methodology {
    background: linear-gradient(135deg, rgba(99,102,241,0.08) 0%, rgba(6,182,212,0.08) 100%);
    padding: 24px 32px;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
    text-align: left;
    margin-top: 32px;
}
.methodology strong { color: var(--dark); }

/* EXPERIENCE */
.experience-section { background: var(--gray-50); }
.experience-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.exp-card {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.exp-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: var(--gradient-primary);
}
.exp-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.exp-header h3 { font-size: 1.5rem; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.role { display: inline-block; font-weight: 600; color: var(--primary); margin-bottom: 20px; font-size: 0.95rem; }
.exp-card > p { color: var(--gray-600); margin-bottom: 16px; }
.exp-card ul { margin-bottom: 24px; }
.exp-card li { padding: 8px 0 8px 24px; position: relative; color: var(--gray-600); }
.exp-card li::before { content: '→'; position: absolute; left: 0; color: var(--primary); font-weight: bold; }
.exp-card li strong { color: var(--dark); }
.stack-container { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.stack-badge {
    background: linear-gradient(135deg, rgba(99,102,241,0.1) 0%, rgba(6,182,212,0.1) 100%);
    color: var(--primary-dark);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid rgba(99,102,241,0.2);
}

/* EXPERTISE */
.expertise-details { background: var(--white); }
.expertise-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.expert-item {
    background: var(--gray-50);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    text-align: center;
}
.expert-item:hover {
    background: var(--white);
    border-color: var(--primary);
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    transform: translateY(-4px);
}
.expert-item h4 { font-size: 1.15rem; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.expert-item p { font-size: 0.95rem; color: var(--gray-500); line-height: 1.7; }

/* EDUCATION */
.education-section { background: var(--gray-50); }
.education-card {
    text-align: center;
    background: var(--white);
    padding: 60px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
    border: 1px solid var(--gray-200);
}
.education-card h3 { font-size: 1.75rem; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.education-card p { color: var(--gray-500); font-size: 1.1rem; }
.school {
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-top: 12px;
    font-size: 1.15rem;
}

/* CTA */
.cta-section { background: var(--dark); position: relative; overflow: hidden; }
.cta-section::before {
    content: '';
    position: absolute;
    top: -50%; left: 50%;
    transform: translateX(-50%);
    width: 100%; height: 200%;
    background: radial-gradient(ellipse at center, rgba(99,102,241,0.2) 0%, transparent 60%);
}
.cta-content { text-align: center; position: relative; z-index: 1; max-width: 600px; margin: 0 auto; }
.cta-content h2 { color: var(--white); margin-bottom: 24px; }
.cta-content p { color: var(--gray-400); font-size: 1.15rem; margin-bottom: 16px; }
.cta-content .btn-outline { margin-top: 24px; }

/* FOOTER */
footer { background: var(--gray-900); color: var(--gray-400); padding: 48px 0; text-align: center; }
footer p { margin-bottom: 16px; }
.socials { display: flex; justify-content: center; gap: 24px; }
.socials a { color: var(--gray-400); font-weight: 500; padding: 8px 16px; border-radius: var(--radius); }
.socials a:hover { color: var(--white); background: rgba(255,255,255,0.1); }

/* BURGER */
.burger { display: none; cursor: pointer; padding: 8px; border-radius: 6px; }
.burger:hover { background: var(--gray-100); }
.burger div { width: 24px; height: 2px; background-color: var(--dark); margin: 5px 0; border-radius: 2px; }

/* PORTFOLIO PAGE */
.portfolio-header {
    padding: 140px 0 60px;
    background: var(--dark);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.portfolio-header::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(ellipse at top, rgba(99,102,241,0.2) 0%, transparent 60%);
}
.portfolio-header h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    position: relative;
}
.portfolio-header p { color: var(--gray-400); font-size: 1.2rem; position: relative; }

.portfolio-section { padding: 80px 0; background: var(--gray-50); }
.portfolio-section.bg-light { background: var(--white); }
.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 40px;
    display: flex;
    align-items: center;
    gap: 16px;
    text-align: left;
}
.section-title::before {
    content: '';
    width: 4px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: 4px;
}

/* PROJECT CARDS */
.grid-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 32px; }
.project-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.project-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); }
.project-image {
    position: relative;
    overflow: hidden;
    height: 220px;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
}
.project-image img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.project-card:hover .project-image img { transform: scale(1.05); }
.project-info { padding: 28px; display: flex; flex-direction: column; flex-grow: 1; }
.project-info h3 { font-size: 1.35rem; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.project-desc { color: var(--gray-500); font-size: 0.95rem; line-height: 1.7; margin-bottom: 20px; flex-grow: 1; }
.project-tech {
    background: var(--gray-50);
    padding: 16px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
}
.project-tech strong { color: var(--dark); display: block; margin-bottom: 4px; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.5px; }
.project-status { margin-top: 16px; }
.project-status span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: var(--dark);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
}
.project-note {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    background: rgba(251, 191, 36, 0.08);
    border: 1px solid rgba(251, 191, 36, 0.3);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-top: 16px;
    font-size: 0.85rem;
    color: var(--gray-600);
    line-height: 1.6;
}
.project-note-icon { flex-shrink: 0; font-size: 1rem; margin-top: 1px; }
.project-links { margin-top: 20px; }
.project-links .btn {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 12px 24px;
    font-size: 0.9rem;
    box-shadow: 0 4px 14px rgba(99,102,241,0.3);
}
.project-links .btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(99,102,241,0.4); }

/* CLIENT CARDS */
.client-projects-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.client-card {
    background: var(--gray-50);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.client-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 4px; height: 100%;
    background: var(--gray-300);
    transition: var(--transition);
}
.client-card:hover { background: var(--white); box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1); transform: translateY(-4px); }
.client-card:hover::before { background: var(--gradient-primary); }
.client-card-header h3 { font-size: 1.25rem; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.client-desc { color: var(--gray-500); font-size: 0.95rem; line-height: 1.7; margin-bottom: 16px; }
.client-tech {
    background: var(--white);
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
}
.client-tech strong { color: var(--primary); font-weight: 600; }

/* RESPONSIVE */
@media screen and (max-width: 1024px) {
    .expertise-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media screen and (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 72px; left: 0; right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        gap: 8px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    .nav-links.active { transform: translateY(0); opacity: 1; visibility: visible; }
    .burger { display: block; }
    .hero { padding: 100px 0 60px; min-height: auto; }
    .hero-content { grid-template-columns: 1fr; gap: 48px; text-align: center; }
    .hero-text h1 { font-size: 2.25rem; }
    .intro-description { margin-left: auto; margin-right: auto; }
    .hero-buttons { justify-content: center; }
    .hero-image { max-width: 320px; margin: 0 auto; order: -1; }
    .experience-grid { grid-template-columns: 1fr; }
    .expertise-grid-4 { grid-template-columns: 1fr; }
    .expert-item { text-align: left; }
    section { padding: 60px 0; }
    h2 { font-size: 1.75rem; margin-bottom: 32px; }
    .grid-container { grid-template-columns: 1fr; }
    .client-projects-list { grid-template-columns: 1fr; }
    .portfolio-header { padding: 120px 0 48px; }
    .education-card { padding: 40px 24px; }
}

@media screen and (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-text h1 { font-size: 1.875rem; }
    .btn { padding: 12px 20px; font-size: 0.9rem; width: 100%; justify-content: center; }
    .hero-buttons { flex-direction: column; }
    .exp-card { padding: 24px; }
    .project-info { padding: 20px; }
    .client-card { padding: 24px; }
}

/* ANIMATIONS */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.hero-text, .hero-image { animation: fadeInUp 0.8s ease-out; }
.hero-image { animation-delay: 0.2s; }