/* ===== NEXUS CALC SHARED STYLES ===== */

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

/* ===== LAYOUT & CONTAINERS ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== HEADER & NAVIGATION ===== */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    text-decoration: none;
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 2rem;
    background: linear-gradient(45deg, #ffd700, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="white" opacity="0.1"><polygon points="0,100 1000,0 1000,100"/></svg>') no-repeat bottom;
    background-size: cover;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #fff, #f0f8ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== BUTTONS ===== */
.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin: 2rem 0;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 15px 25px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.download-btn i {
    font-size: 1.5rem;
}

/* ===== SECTIONS ===== */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #2d3748;
}

/* Light background sections */
.features,
.support {
    padding: 80px 0;
    background: #f8fafc;
}

/* White background sections */
.tech-stack,
.faq {
    padding: 80px 0;
    background: white;
}

/* Gradient background sections */
.app-preview,
.download-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.app-preview h2,
.download-section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    font-weight: 700;
}

.download-section p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* ===== CARDS & GRIDS ===== */
.features-grid,
.support-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 3rem;
}

.support-grid {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 3rem;
}

.feature-card,
.support-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.support-card {
    padding: 2.5rem;
}

.feature-card:hover,
.support-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon,
.support-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.support-icon {
    margin-bottom: 1.5rem;
}

.feature-card h3,
.support-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2d3748;
    font-weight: 600;
}

.support-card h3 {
    font-size: 1.5rem;
}

.feature-card p,
.support-card p {
    color: #64748b;
    line-height: 1.6;
}

.support-card p {
    margin-bottom: 1.5rem;
}

.tech-card {
    text-align: center;
    padding: 2rem;
    background: #f8fafc;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
}

.tech-card i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #667eea;
}

.tech-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.tech-card p {
    color: #64748b;
}

/* ===== CONTACT INFO ===== */
.contact-info {
    background: #f1f5f9;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.contact-info a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    display: block;
    margin: 0.5rem 0;
}

.contact-info a:hover {
    color: #764ba2;
}

/* ===== FAQ SECTION ===== */
.faq-grid {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #f8fafc;
    margin-bottom: 1rem;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e2e8f0;
}

.faq-question {
    background: white;
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: #2d3748;
    transition: background-color 0.3s ease;
}

.faq-question:hover {
    background: #f8fafc;
}

.faq-question i {
    transition: transform 0.3s ease;
}

.faq-question.active i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    color: #64748b;
}

.faq-answer.active {
    padding: 1.5rem;
    max-height: 200px;
}

/* ===== APP PREVIEW SECTION ===== */
.preview-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    align-items: center;
    margin-top: 3rem;
}

.preview-text {
    text-align: left;
}

.preview-text h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.preview-text p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

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

.preview-features li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.preview-features i {
    color: #ffd700;
    font-size: 1.2rem;
}

.phone-mockup {
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 600" fill="white" opacity="0.1"><rect x="20" y="20" width="260" height="560" rx="30" fill="currentColor"/><rect x="40" y="60" width="220" height="480" fill="rgba(102,126,234,0.3)"/></svg>') no-repeat center;
    background-size: contain;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    opacity: 0.3;
}

/* ===== FOOTER ===== */
footer {
    background: #2d3748;
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-section p,
.footer-section a {
    color: #a0aec0;
    text-decoration: none;
    line-height: 1.8;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #4a5568;
    padding-top: 2rem;
    margin-top: 2rem;
    color: #a0aec0;
}

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

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

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

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

    .hero .subtitle {
        font-size: 1.1rem;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .preview-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .section-title {
        font-size: 2rem;
    }

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

    nav {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .features,
    .app-preview,
    .tech-stack,
    .support,
    .faq,
    .download-section {
        padding: 60px 0;
    }
}