/* ========================================
   PROFESSIONAL PORTFOLIO - CLEAN & CORPORATE
   ======================================== */

/* === CSS VARIABLES === */
:root {
    /* Professional Color Palette */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;

    --color-secondary: #64748b;
    --color-secondary-dark: #475569;
    --color-secondary-light: #94a3b8;

    --color-accent: #0ea5e9;

    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', 'Inter', sans-serif;

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

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--color-gray-800);
    background-color: var(--color-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === TYPOGRAPHY === */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-gray-900);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-700);
}

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

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

/* === UTILITY CLASSES === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-xl);
    color: var(--color-gray-900);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(to right, var(--color-primary), var(--color-accent));
    border-radius: 2px;
}

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

.text-center .section-title::after {
    left: 50%;
    transform: translateX(-50%);
}

/* === HEADER === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header .container {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: -0.5px;
}

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

/* Navigation */
.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
    align-items: center;
}

.nav-link {
    color: var(--color-gray-700);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-gray-50);
}

.nav-link.active {
    color: var(--color-primary);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--color-gray-100);
    padding: 0.25rem;
    border-radius: var(--radius-md);
}

.lang-btn {
    padding: 0.375rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--color-gray-700);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    color: var(--color-primary);
}

.lang-btn.active {
    background: var(--color-white);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-gray-800);
    transition: all var(--transition-base);
    border-radius: 2px;
}

/* === HERO SECTION === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
    position: relative;
    overflow: hidden;
    z-index: 2; /* keep hero above following sections while in view */
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(37, 99, 235, 0.03) 100%);
    z-index: 0;
    pointer-events: none; /* prevent overlay from blocking clicks */
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 700px;
}

.hero-greeting {
    font-size: 1.125rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

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

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    color: var(--color-white);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.btn-outline {
    background: transparent;
    color: var(--color-gray-700);
    border: 2px solid var(--color-gray-300);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* === ABOUT SECTION === */
.about {
    background: var(--color-white);
    position: relative;
    z-index: 1; /* ensure it doesn't overlay hero CTA while scrolling into view */
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-text h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-900);
}

.about-text p {
    font-size: 1.0625rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--color-gray-700);
    font-size: 0.875rem;
}

/* === EXPERIENCE SECTION === */
.experience {
    background: var(--color-gray-50);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-gray-200);
}

.timeline-item {
    position: relative;
    padding-left: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
}

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

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--color-primary);
    border: 3px solid var(--color-white);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--color-gray-100);
}

.timeline-date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-gray-900);
}

.timeline-company {
    color: var(--color-secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.timeline-description {
    color: var(--color-gray-700);
    line-height: 1.7;
}

/* === PROJECTS SECTION === */
.projects {
    background: var(--color-white);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-200);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: 3rem;
    font-weight: 700;
}

.project-content {
    padding: var(--spacing-lg);
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-900);
}

.project-description {
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tag {
    padding: 0.25rem 0.75rem;
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.project-link {
    color: var(--color-primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.project-link:hover {
    gap: 0.75rem;
}

/* === SKILLS SECTION === */
.skills {
    background: var(--color-gray-50);
}

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

.skill-category {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.skill-category h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--color-gray-900);
    font-size: 1.5rem;
}

.skill-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.skill-item {
    padding: var(--spacing-md);
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 500;
    color: var(--color-gray-800);
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.skill-item:hover {
    background: var(--color-white);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* === TECH WATCH SECTION === */
.tech-watch {
    background: var(--color-white);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.tech-card {
    padding: var(--spacing-xl);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
    transition: all var(--transition-base);
}

.tech-card:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
}

.tech-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-900);
}

.tech-card p {
    color: var(--color-gray-700);
    line-height: 1.7;
}

/* === CONTACT SECTION === */
.contact {
    background: var(--color-gray-50);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-email {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    display: block;
    word-break: break-word;
}

.contact-email:hover {
    color: var(--color-primary-dark);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    background: var(--color-white);
    color: var(--color-gray-700);
    border-radius: var(--radius-md);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.contact-location {
    color: var(--color-gray-600);
    font-size: 1.125rem;
}

/* === FOOTER === */
.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer p {
    color: var(--color-gray-400);
    margin: 0;
}

/* === LANGUAGE TOGGLE === */
[data-lang="en"] .lang-fr,
[data-lang="fr"] .lang-en {
    display: none;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    :root {
        --spacing-3xl: 4rem;
        --spacing-2xl: 3rem;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-base);
        pointer-events: none;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

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

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .about-content {
        grid-template-columns: 1fr;
    }

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

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .social-links {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }

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

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

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

/* Hero photo: on desktop placed to the right (absolute), on mobile placed inline under the title */
.hero-inner {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
}
.hero-content {
    flex: 1;
    padding-right: calc(160px + var(--spacing-lg));
}
.hero-photo {
    width: 160px;
    position: absolute;
    right: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-photo img {
    width: 100%;
    height: auto;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-md);
    /* animation: slight scale + fade */
    animation: photo-appear 650ms cubic-bezier(.2,.9,.2,1) both;
    animation-delay: 140ms;
}

/* Photo appear animation */
@keyframes photo-appear {
    0% {
        opacity: 0;
        transform: translateY(10px) scale(0.98);
    }
    60% {
        opacity: 1;
        transform: translateY(-4px) scale(1.02);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (max-width: 768px) {
    .hero-inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .hero-subtitle {
        font-size: 1rem; /* slightly smaller to avoid awkward wrap */
        line-height: 1.4;
    }
    .hero::before {
        top: 400px; /* start parallax much lower on mobile to keep CTA buttons accessible */
        height: 40%;
        width: 50%;
    }
    /* Add breathing space below hero so CTA stays clear before About overlaps */
    .hero {
        padding-bottom: var(--spacing-3xl);
    }
    .hero-content {
        padding-right: 0;
    }
    /* Hide CTA buttons on mobile */
    .hero-cta {
        display: none;
    }
    /* Nudge About down slightly on mobile to avoid immediate overlap */
    .about {
        margin-top: var(--spacing-2xl);
    }
    .hero-photo {
        position: static;
        width: 140px;
        margin-top: var(--spacing-md);
        display: flex;
        justify-content: center; /* ensure centered on mobile */
        margin-left: auto; /* center block horizontally */
        margin-right: auto;
        margin-bottom: var(--spacing-xl); /* larger gap between image and following text */
    }
    .hero-photo img {
        margin: 0 auto; /* center image block */
    }
}