:root {
    --accent-color: #48e0b8;
    --accent-lighter: #71f7d1;
    --accent-rgba: rgba(72, 224, 184, 0.15);
    --accent-rgba-light: rgba(72, 224, 184, 0.2);
    --accent-rgba-hover: rgba(72, 224, 184, 0.25);
    --accent-rgba-border: rgba(72, 224, 184, 0.3);
    --bg-color: #05060a;
    --bg-gradient: radial-gradient(circle at top, rgba(72, 224, 184, 0.15), transparent 45%), #05060a;
    --surface-color: rgba(14, 17, 32, 0.75);
    --card-color: rgba(15, 19, 37, 0.9);
    --text-primary: #f6f7fb;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.08);
    --nav-bg: rgba(6, 7, 14, 0.65);
    --nav-border: rgba(255, 255, 255, 0.08);
    --footer-bg: rgba(5, 6, 10, 0.9);
    --popup-bg: rgba(7, 9, 18, 0.95);
    --popup-overlay: rgba(0, 0, 0, 0.75);
    --input-bg: rgba(255, 255, 255, 0.05);
    --glass-blur: blur(18px);
    --transition: 0.35s 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: 'Space Grotesk', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.7;
    letter-spacing: 0.01em;
    transition: opacity 0.3s ease-in;
}

/* Page transition animations */
main {
    will-change: opacity, transform;
}

section {
    will-change: opacity, transform;
}

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

a {
    color: inherit;
    text-decoration: none;
    position: relative;
    transition: color var(--transition);
}

a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 100%;
    height: 1px;
    background: var(--accent-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

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

a:hover::after {
    transform: scaleX(1);
}

/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 12px 0;
    /* Le header reste fixe pendant les transitions - pas d'animation */
    opacity: 1 !important;
    transform: translateY(0) !important;
}

header.scroll-down {
    transform: translateY(-100%);
    transition: transform var(--transition);
}

header.scroll-up {
    transform: translateY(0);
    transition: transform var(--transition);
}

nav {
    width: min(1200px, 92%);
    margin: 0 auto;
    padding: 14px 24px;
    border-radius: 999px;
    border: 1px solid var(--nav-border);
    background: var(--nav-bg);
    backdrop-filter: var(--glass-blur);
    overflow: hidden;
    isolation: isolate;
    display: flex;
    align-items: center;
    gap: 2rem;
    position: relative;
}

nav h1 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    margin: 0;
}

/* Menu hamburger pour mobile */
.menu-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 40px;
    height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    padding: 0;
    transition: all var(--transition);
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

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

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

nav ul {
    list-style: none;
    display: flex;
    gap: 1.75rem;
    margin-left: auto;
    margin-right: auto;
}

nav ul li a {
    font-size: 0.95rem;
    color: var(--text-secondary);
    padding: 4px 0;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

nav ul li a[aria-current="page"] {
    color: var(--accent-color);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.language-selector-container {
    position: relative;
}

#language-selector {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 2.5rem 0.5rem 1rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    transition: all var(--transition);
    backdrop-filter: blur(12px);
}

#language-selector:hover {
    background: var(--card-color);
    border-color: var(--accent-rgba-border);
    color: var(--accent-color);
}

#language-selector:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-rgba);
}

#language-selector option {
    background: var(--card-color);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 12px;
    font-weight: 500;
}

.language-selector-container::after {
    content: "▼";
    position: absolute;
    right: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 0.65rem;
    pointer-events: none;
    transition: color var(--transition), transform var(--transition);
}

.language-selector-container:hover::after {
    color: var(--accent-color);
    transform: translateY(-50%) scale(1.1);
}

#settings-icon {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 50%;
    width: 38px;
    height: 38px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform var(--transition), background var(--transition);
}

#settings-icon:hover {
    transform: rotate(90deg);
    background: var(--card-color);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.85rem 1.8rem;
    border-radius: 999px;
    border: 1px solid transparent;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: linear-gradient(120deg, var(--accent-color), var(--accent-lighter));
    color: #05060a !important;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
}

.btn.secondary {
    background: transparent;
    color: var(--text-primary) !important;
    border-color: rgba(255, 255, 255, 0.2);
}

.btn.secondary::before {
    display: none;
}

.btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.2);
    opacity: 0;
    transition: opacity var(--transition);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px var(--accent-rgba-hover);
}

.btn:hover::before {
    opacity: 1;
}

/* Sections */
main {
    width: min(1200px, 92%);
    margin: 0 auto;
    padding: 40px 24px 120px;
}

section {
    margin: 120px 0;
    padding: 0 24px;
}

.section-heading {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 48px;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.3em;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

section h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    color: var(--text-primary);
    margin-bottom: 12px;
}

.section-lead {
    color: var(--text-secondary);
    font-size: 1rem;
}

p {
    color: var(--text-secondary);
}

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    text-align: center;
    background: var(--footer-bg);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    letter-spacing: 0.08em;
}

.social-links {
    margin-top: 12px;
    display: flex;
    justify-content: center;
    gap: 24px;
}

.social-links a {
    color: var(--text-primary);
    font-size: 0.95rem;
    letter-spacing: 0.08em;
}

/* Scroll to top */
#scroll-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--card-color);
    color: var(--text-primary);
    font-size: 1.2rem;
    display: none;
    cursor: pointer;
    transition: transform var(--transition), background var(--transition);
    z-index: 99;
}

#scroll-to-top:hover {
    transform: translateY(-4px);
    background: var(--accent-rgba);
}

/* Floating contact button */
#floating-contact-btn {
    position: fixed;
    bottom: 24px;
    left: 24px;
    padding: 16px 24px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: linear-gradient(120deg, var(--accent-color), var(--accent-lighter));
    color: #05060a;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.9rem;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
    z-index: 100;
    box-shadow: 0 8px 24px var(--accent-rgba-light);
    display: flex;
    align-items: center;
    gap: 8px;
}

@media (max-width: 768px) {
    #scroll-to-top {
        bottom: 80px;
    }
}

#floating-contact-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px var(--accent-rgba-hover);
}

#floating-contact-btn svg {
    width: 20px;
    height: 20px;
}

/* Contact popup modal */
.contact-popup-overlay {
    position: fixed;
    inset: 0;
    background: var(--popup-overlay);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    transition: opacity var(--transition);
}

.contact-popup-overlay.active {
    display: flex;
    opacity: 1;
}

.contact-popup {
    background: var(--popup-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 32px;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9);
    transition: transform var(--transition);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.contact-popup-overlay.active .contact-popup {
    transform: scale(1);
}

.contact-popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.contact-popup-header h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin: 0;
}

.contact-popup-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all var(--transition);
}

.contact-popup-close:hover {
    background: var(--surface-color);
    color: var(--text-primary);
}

.contact-popup-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-popup-form input,
.contact-popup-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--transition);
}

.contact-popup-form input:focus,
.contact-popup-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.contact-popup-form textarea {
    min-height: 120px;
    resize: vertical;
}

.contact-popup-form button[type="submit"] {
    margin-top: 8px;
}

/* CV and LinkedIn buttons in header */
.nav-cv-btn,
.nav-linkedin-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition);
}

.nav-cv-btn:hover,
.nav-linkedin-btn:hover {
    background: var(--accent-rgba);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.nav-cv-btn svg,
.nav-linkedin-btn svg {
    width: 18px;
    height: 18px;
}

/* QR Code modal */
.qr-code-overlay {
    position: fixed;
    inset: 0;
    background: var(--popup-overlay);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    transition: opacity var(--transition);
}

.qr-code-overlay.active {
    display: flex;
    opacity: 1;
}

.qr-code-modal {
    background: var(--popup-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 32px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    position: relative;
    transform: scale(0.9);
    transition: transform var(--transition);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.qr-code-overlay.active .qr-code-modal {
    transform: scale(1);
}

.qr-code-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.qr-code-modal-header h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin: 0;
}

.qr-code-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all var(--transition);
}

.qr-code-close:hover {
    background: var(--surface-color);
    color: var(--text-primary);
}

#qr-code-canvas {
    background: white;
    padding: 16px;
    border-radius: 12px;
    margin: 0 auto 16px;
    display: block;
}

.qr-code-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 16px;
}

/* Color picker */
.color-picker {
    position: absolute;
    top: 72px;
    right: 40px;
    padding: 18px 22px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--card-color);
    backdrop-filter: blur(16px);
    color: var(--text-primary);
    display: none;
    min-width: 220px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
}


.color-picker label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    padding: 6px 0;
    cursor: pointer;
    transition: color var(--transition);
    color: var(--text-primary);
}

.color-picker label span {
    color: var(--text-primary);
}

.color-picker label:hover {
    color: var(--accent-color);
}

.color-picker label:hover span {
    color: var(--accent-color);
}

.color-picker input[type="radio"] {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    position: relative;
    cursor: pointer;
}

.color-picker input[type="radio"]:checked {
    border-color: var(--accent-color);
}

.color-picker input[type="radio"]:checked::after {
    content: "";
    position: absolute;
    inset: 3px;
    border-radius: 50%;
    background: var(--accent-color);
}

/* Utilities */
.project-card,
.skill-item {
    border-color: var(--border-color);
    transition: transform var(--transition), border var(--transition);
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent-color);
}

/* Responsive */
@media (max-width: 992px) {
    nav {
        flex-wrap: wrap;
        border-radius: 24px;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    header {
        padding: 8px 0;
    }

    nav {
        flex-wrap: nowrap;
        padding: 10px 16px;
        gap: 1rem;
        border-radius: 16px;
        overflow: visible;
    }

    nav h1 {
        font-size: 1rem;
        flex: 1;
        min-width: 0;
    }

    .menu-toggle {
        display: flex;
        order: 3;
        margin-left: auto;
    }

    nav ul {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        left: 0;
        right: 0;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--card-color);
        backdrop-filter: blur(20px);
        border: 1px solid var(--border-color);
        border-radius: 16px;
        padding: 8px;
        margin: 0;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        z-index: 101;
    }

    nav ul.active {
        display: flex !important;
    }

    nav ul li {
        width: 100%;
    }

    nav ul li a {
        display: block;
        padding: 12px 16px;
        border-radius: 8px;
        font-size: 0.9rem;
        text-align: left;
    }

nav ul li a:hover {
    background: var(--accent-rgba);
}

    .nav-controls {
        display: flex;
        gap: 0.5rem;
        order: 2;
    }

    #language-selector {
        padding: 0.4rem 2rem 0.4rem 0.8rem;
        font-size: 0.75rem;
    }

    #settings-icon {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }

    .nav-cv-btn,
    .nav-linkedin-btn {
        padding: 6px 12px;
        font-size: 0.75rem;
    }

    .nav-cv-btn svg,
    .nav-linkedin-btn svg {
        width: 16px;
        height: 16px;
    }

    .nav-cv-btn span,
    .nav-linkedin-btn span {
        display: none;
    }

    #floating-contact-btn {
        bottom: 80px;
        left: 16px;
        padding: 12px 18px;
        font-size: 0.8rem;
    }

    #floating-contact-btn span {
        display: none;
    }

    #floating-contact-btn svg {
        width: 24px;
        height: 24px;
    }

    main {
        width: 90%;
        padding: 40px 16px 120px;
    }

    section {
        margin: 80px 0;
        padding: 0 16px;
    }
}

@media (max-width: 480px) {
    header {
        padding: 6px 0;
    }

    nav {
        padding: 8px 12px;
        gap: 0.75rem;
    }

    nav h1 {
        font-size: 0.9rem;
    }

    .menu-toggle {
        width: 36px;
        height: 36px;
    }

    .menu-toggle span {
        width: 20px;
    }

    nav ul {
        top: calc(100% + 6px);
        padding: 6px;
    }

    nav ul li a {
        padding: 10px 12px;
        font-size: 0.85rem;
    }

    #language-selector {
        padding: 0.35rem 1.8rem 0.35rem 0.7rem;
        font-size: 0.7rem;
    }

    #settings-icon {
        width: 28px;
        height: 28px;
        font-size: 0.8rem;
    }

    section h2 {
        font-size: 1.75rem;
    }

    .btn {
        width: 100%;
    }

    .nav-cv-btn span,
    .nav-linkedin-btn span {
        display: none;
    }

    #floating-contact-btn {
        bottom: 70px;
        left: 12px;
        padding: 10px 14px;
        font-size: 0.75rem;
    }

    #floating-contact-btn span {
        display: none;
    }
}