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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1d4ed8;
    --accent-color: #3b82f6;
    --text-color: #0f172a;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-light: #eff6ff;
    --border-color: #e2e8f0;
    --nav-bg: #0f172a;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container-fluid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.main-header {
    background-color: var(--nav-bg);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--primary-color);
}

.navigation-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.brand-logo a {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #ffffff;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.brand-logo .logo-icon {
    width: 46px;
    height: 46px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 800;
    color: #fff;
    border: 2px solid rgba(59,130,246,0.5);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-menu a {
    text-decoration: none;
    color: #cbd5e1;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: color 0.2s, background-color 0.2s;
    font-size: 15px;
}

.nav-menu a:hover,
.nav-menu a.active-link {
    color: #ffffff;
    background-color: var(--primary-color);
}

.language-selector {
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background-color: transparent;
    color: #cbd5e1;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
    font-family: inherit;
}

.language-selector:hover {
    background-color: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
}

.language-selector:focus {
    outline: none;
    background-color: rgba(59, 130, 246, 0.15);
    border-color: var(--primary-color);
    color: #ffffff;
}

.language-selector option {
    background-color: #0f172a;
    color: #ffffff;
}

.hero-banner {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #2563eb 100%);
    color: white;
    padding: 90px 0;
    position: relative;
    overflow: hidden;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero-banner .container-fluid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 44px;
    margin-bottom: 22px;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.hero-content h1 span {
    color: var(--accent-color);
}

.hero-content p {
    font-size: 17px;
    margin-bottom: 35px;
    opacity: 0.9;
    line-height: 1.75;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--accent-color);
    color: #ffffff;
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 15px;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
    letter-spacing: 0.2px;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(59,130,246,0.4);
    background-color: #60a5fa;
}

.hero-visual img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.4);
    border: 2px solid rgba(59,130,246,0.3);
}

.features-section,
.tools-section,
.why-choose,
.about-content,
.contact-section {
    padding: 88px 0;
}

.features-section {
    background-color: var(--bg-light);
}

.features-section h2,
.tools-section h2,
.why-choose h2,
.testimonials h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 55px;
    color: var(--text-color);
    font-weight: 800;
    letter-spacing: -0.3px;
}

.section-tag {
    display: block;
    text-align: center;
    color: var(--primary-color);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.features-grid,
.tools-grid,
.benefits-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 28px;
}

.feature-card,
.tool-card,
.benefit-item {
    background-color: white;
    padding: 36px 28px;
    border-radius: 16px;
    box-shadow: 0 2px 16px rgba(15,23,42,0.06);
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    text-align: center;
    border: 2px solid transparent;
}

.feature-card:hover,
.tool-card:hover,
.benefit-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 30px rgba(37,99,235,0.12);
    border-color: var(--accent-color);
}

.feature-card i,
.tool-card i,
.benefit-item i {
    color: var(--primary-color);
    margin-bottom: 22px;
}

.feature-card h3,
.tool-card h3,
.benefit-item h3 {
    font-size: 20px;
    margin-bottom: 14px;
    color: var(--text-color);
    font-weight: 700;
}

.feature-card p,
.tool-card p,
.benefit-item p {
    color: var(--text-light);
    line-height: 1.75;
    font-size: 15px;
}

.tool-card a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 18px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: gap 0.2s;
}

.tool-card a:hover {
    gap: 10px;
}

.random-fact {
    background: linear-gradient(135deg, #1e3a8a, var(--primary-color));
    color: white;
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.random-fact::after {
    content: '';
    position: absolute;
    bottom: -30px;
    right: -30px;
    width: 200px;
    height: 200px;
    background: rgba(255,255,255,0.04);
    border-radius: 50%;
}

.random-fact h2 {
    font-size: 26px;
    margin-bottom: 18px;
    font-weight: 700;
}

.random-fact p {
    font-size: 17px;
    max-width: 860px;
    margin: 0 auto;
    line-height: 1.85;
    opacity: 0.95;
}

.future-quote {
    padding: 80px 0;
    background-color: var(--nav-bg);
}

.future-quote blockquote {
    max-width: 860px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

.future-quote i {
    color: var(--accent-color);
    font-size: 42px;
    margin-bottom: 24px;
}

.future-quote p {
    font-size: 23px;
    font-style: italic;
    color: #e2e8f0;
    line-height: 1.65;
    margin-bottom: 24px;
    font-weight: 300;
}

.future-quote footer {
    font-size: 15px;
    color: #64748b;
    font-style: normal;
    font-weight: 500;
}

.main-footer {
    background-color: #0a0f1e;
    color: white;
    padding: 70px 0 24px;
}

.footer-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 44px;
    margin-bottom: 44px;
}

.footer-column h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #f1f5f9;
}

.footer-accent-bar {
    width: 36px;
    height: 3px;
    background-color: var(--accent-color);
    margin-bottom: 14px;
    border-radius: 2px;
}

.footer-column p {
    color: #94a3b8;
    font-size: 14px;
    line-height: 1.8;
}

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

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul a {
    color: #94a3b8;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.footer-column ul a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 24px;
    text-align: center;
    color: #475569;
    font-size: 14px;
}

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: #0f172a;
    color: white;
    padding: 20px 24px;
    z-index: 9999;
    border-top: 3px solid var(--primary-color);
    display: none;
}

.cookie-banner.show {
    display: block;
}

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.cookie-content p {
    font-size: 14px;
    color: #cbd5e1;
    line-height: 1.6;
}

.cookie-content a {
    color: var(--accent-color);
    text-decoration: underline;
}

.cookie-buttons {
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

.cookie-btn {
    padding: 10px 22px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: transform 0.2s, opacity 0.2s;
}

.cookie-btn:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

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

.decline-btn {
    background-color: transparent;
    color: #94a3b8;
    border: 1px solid #334155;
}

.page-hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
    color: white;
    padding: 70px 0;
    text-align: center;
}

.page-hero h1 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 14px;
}

.page-hero p {
    font-size: 17px;
    opacity: 0.85;
    max-width: 600px;
    margin: 0 auto;
}

.calculator-wrapper {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.calc-container {
    max-width: 480px;
    margin: 0 auto;
    background: white;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(37,99,235,0.12);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.calc-display {
    background: linear-gradient(135deg, #0f172a, #1e3a8a);
    padding: 28px 28px 20px;
    text-align: right;
}

.calc-expression {
    font-size: 14px;
    color: #94a3b8;
    min-height: 20px;
    margin-bottom: 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.calc-result {
    font-size: 46px;
    color: white;
    font-weight: 300;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background-color: var(--border-color);
}

.calc-btn {
    padding: 22px 10px;
    border: none;
    background: white;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.15s, color 0.15s;
    color: var(--text-color);
}

.calc-btn:hover {
    background-color: #f1f5f9;
}

.calc-btn.operator {
    color: var(--primary-color);
    font-weight: 700;
}

.calc-btn.equals {
    background-color: var(--primary-color);
    color: white;
    font-weight: 700;
}

.calc-btn.equals:hover {
    background-color: var(--secondary-color);
}

.calc-btn.clear {
    color: #ef4444;
    font-weight: 700;
}

.calc-btn.span-two {
    grid-column: span 2;
}

.calc-info {
    margin-top: 60px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.calc-info-card {
    background: white;
    padding: 28px 24px;
    border-radius: 16px;
    box-shadow: 0 2px 12px rgba(15,23,42,0.06);
    border: 1px solid var(--border-color);
}

.calc-info-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-color);
}

.calc-info-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.75;
}

.about-story {
    padding: 88px 0;
}

.about-story .container-fluid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 70px;
    align-items: center;
}

.about-story img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 16px 40px rgba(37,99,235,0.12);
}

.about-text h2 {
    font-size: 34px;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--text-color);
}

.about-text p {
    color: var(--text-light);
    font-size: 16px;
    line-height: 1.85;
    margin-bottom: 16px;
}

.about-stats {
    background-color: var(--bg-light);
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 28px;
    text-align: center;
}

.stat-item h3 {
    font-size: 46px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-item p {
    color: var(--text-light);
    font-size: 15px;
    font-weight: 500;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h2 {
    font-size: 34px;
    font-weight: 800;
    margin-bottom: 20px;
}

.contact-info p {
    color: var(--text-light);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.contact-detail-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-detail-item i {
    color: var(--primary-color);
    font-size: 20px;
    margin-top: 2px;
}

.contact-detail-item h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-detail-item p {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 0;
}

.contact-form-box {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 4px 24px rgba(37,99,235,0.08);
    border: 1px solid var(--border-color);
}

.contact-form-box h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 28px;
    color: var(--text-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 7px;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 15px;
    color: var(--text-color);
    font-family: inherit;
    transition: border-color 0.2s;
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 130px;
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.2s;
}

.submit-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.legal-page {
    padding: 80px 0;
}

.legal-page h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 8px;
}

.legal-date {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 40px;
}

.legal-page h2 {
    font-size: 22px;
    font-weight: 700;
    margin: 36px 0 14px;
    color: var(--text-color);
}

.legal-page p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.85;
    margin-bottom: 16px;
}

.legal-page ul {
    margin: 12px 0 16px 24px;
    color: var(--text-light);
    font-size: 15px;
    line-height: 2;
}

.form-success {
    display: none;
    background-color: #d1fae5;
    border: 1px solid #6ee7b7;
    color: #065f46;
    padding: 14px 18px;
    border-radius: 10px;
    font-size: 14px;
    margin-top: 16px;
}

@media (max-width: 768px) {
    .hero-banner .container-fluid,
    .about-story .container-fluid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-content h1 {
        font-size: 30px;
    }

    .page-hero h1 {
        font-size: 28px;
    }

    .nav-menu {
        gap: 4px;
    }

    .nav-menu a {
        padding: 7px 10px;
        font-size: 13px;
    }

    .brand-logo a {
        font-size: 18px;
    }

    .calc-result {
        font-size: 34px;
    }
}