:root {
    --primary: #0066CC;
    --secondary: #0099FF;
    --accent: #00C853;
    --light-bg: #FFFFFF;
    --light-gray: #F5F7FA;
    --medium-gray: #E8EDF2;
    --text-primary: #1A2332;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --card-bg: #FFFFFF;
    --card-shadow: rgba(0, 0, 0, 0.08);
    --hover-shadow: rgba(0, 102, 204, 0.15);
}

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

body {
    font-family: 'IBM Plex Sans', sans-serif;
    background: var(--light-bg);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Language Switcher */
.lang-switch {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    box-shadow: 0 2px 8px var(--card-shadow);
}

.lang-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    border-radius: 4px;
    transition: all 0.3s;
}

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

.lang-btn:hover:not(.active) {
    background: var(--light-gray);
    color: var(--primary);
}

/* Header */
header {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px var(--card-shadow);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'IBM Plex Mono', monospace;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.main-nav {
    display: flex;
}

.nav-menu {
    display: flex !important;
    flex-direction: row !important;
    gap: 0.5rem;
    list-style: none;
    align-items: center;
    flex-wrap: nowrap !important;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    flex: 0 1 auto;
    min-width: 0;
    display: inline-block;
}

nav a {
    display: block;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.25s ease;
    white-space: nowrap;
    padding: 0.6rem 1.2rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    text-align: center;
}

nav a:hover {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

nav a:active {
    color: var(--secondary);
}

/* Hero */
.hero {
    padding: 6rem 0 4rem;
    text-align: center;
    background: linear-gradient(135deg, #F8FAFC 0%, #EFF6FF 100%);
    border-bottom: 1px solid var(--border);
}

.hero-label {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(0, 102, 204, 0.1);
    border: 1px solid var(--primary);
    border-radius: 50px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2rem;
    color: var(--primary);
    font-weight: 500;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-primary);
}

.hero .highlight {
    color: var(--primary);
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 3rem;
    line-height: 1.6;
}

.cta-primary {
    display: inline-block;
    padding: 1.2rem 3rem;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s;
    box-shadow: 0 4px 20px rgba(0, 82, 204, 0.4);
}

.cta-primary:hover {
    background: #0065FF;
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 82, 204, 0.5);
}

/* Signs Section */
.section {
    padding: 5rem 0;
    background: var(--light-bg);
}

.section-alt {
    background: var(--light-gray);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1rem;
    font-weight: 600;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Problem Cards */
.problems-grid {
    display: grid;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.problem-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s;
    display: flex;
    gap: 1.5rem;
    box-shadow: 0 1px 3px var(--card-shadow);
}

.problem-card:hover {
    border-color: var(--primary);
    transform: translateX(10px);
    box-shadow: 0 4px 12px var(--hover-shadow);
}

.problem-number {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    min-width: 60px;
}

.problem-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.problem-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.benefit-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 1px 3px var(--card-shadow);
}

.benefit-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--hover-shadow);
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.benefit-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.benefit-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* What is Section */
.what-is-content {
    max-width: 900px;
    margin: 0 auto;
}

.what-is-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

/* Stats */
.stats-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 3rem 0;
}

.stat-card {
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 1px 3px var(--card-shadow);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    font-family: 'IBM Plex Mono', monospace;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Why Choose */
.why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.why-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2.5rem;
    transition: all 0.3s;
    box-shadow: 0 1px 3px var(--card-shadow);
}

.why-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--hover-shadow);
}

.why-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.why-card h3 {
    font-size: 1.3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.why-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
    padding: 5rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.cta-section p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Footer */
footer {
    background: #F8FAFC;
    padding: 3rem 0 1.5rem;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-about h3 {
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.footer-about p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.footer-links h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    line-height: 2;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Language Content */
html[lang="en"] [lang="fr"] { display: none !important; }
html[lang="en"] [lang="en"] { display: block !important; }
html[lang="fr"] [lang="fr"] { display: block !important; }
html[lang="fr"] [lang="en"] { display: none !important; }

/* Navigation menu language switching */
html[lang="fr"] .nav-menu[lang="en"] { display: none !important; }
html[lang="en"] .nav-menu[lang="fr"] { display: none !important; }

/* Tabs System */
.tabs-container {
    margin: 3rem 0;
}

.tabs-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.tab-btn {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    color: var(--text-secondary);
    box-shadow: 0 1px 3px var(--card-shadow);
}

.tab-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--hover-shadow);
}

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 4px 12px var(--hover-shadow);
}

.tab-number {
    display: block;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.tab-btn.active .tab-number {
    color: white;
}

.tab-title {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.3;
}

.tabs-content {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 3rem;
    min-height: 400px;
    box-shadow: 0 1px 3px var(--card-shadow);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-description {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.tab-list {
    list-style: none;
    margin: 2rem 0;
}

.tab-list li {
    color: var(--text-secondary);
    padding: 0.75rem 0 0.75rem 2rem;
    position: relative;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.tab-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
    font-size: 1.2rem;
}

.tab-result {
    background: rgba(0, 200, 83, 0.05);
    border-left: 3px solid var(--accent);
    padding: 1.5rem;
    margin-top: 2rem;
    border-radius: 4px;
    border: 1px solid rgba(0, 200, 83, 0.2);
}

.tab-result strong {
    color: var(--accent);
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.tab-result p {
    color: var(--text-secondary);
    margin: 0;
}

/* Responsive */
@media (max-width: 1024px) {
    .tabs-nav {
        grid-template-columns: 1fr 1fr;
    }

    .why-grid,
    .footer-content {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-menu {
        gap: 0.25rem !important;
    }

    .nav-menu li {
        flex: 0 1 auto;
    }

    .nav-menu a {
        font-size: 0.65rem;
        padding: 0.5rem 0.4rem;
        white-space: nowrap;
    }

    .tabs-nav,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .tabs-content {
        padding: 2rem;
    }
}