/* =============================================
   Five Star Air Tech - Main Stylesheet
   ============================================= */

:root {
    --blue-dark:   #0a1628;
    --blue-mid:    #0e2a5c;
    --blue-accent: #1a6fb5;
    --blue-light:  #2e9cdb;
    --cyan:        #00c8e8;
    --white:       #ffffff;
    --gray-light:  #f4f7fb;
    --gray-mid:    #e2e8f0;
    --gray-text:   #5a6a7e;
    --text-dark:   #0d1f3c;
    --border:      #d0dce8;
    --shadow:      0 4px 24px rgba(10, 22, 40, 0.10);
    --radius:      12px;
    --transition:  all 0.25s ease;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: var(--text-dark);
    background: var(--white);
}

/* ---- Utility ---- */
.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 620px;
    margin: 0 auto 56px;
}

.section-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--blue-accent);
    background: rgba(26, 111, 181, 0.08);
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 14px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 14px;
    line-height: 1.25;
}

.section-header p {
    color: var(--gray-text);
    font-size: 1rem;
}

/* ---- Buttons ---- */
.btn {
    display: inline-block;
    padding: 13px 30px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--blue-accent);
    color: var(--white);
    border-color: var(--blue-accent);
}
.btn-primary:hover {
    background: var(--blue-mid);
    border-color: var(--blue-mid);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 111, 181, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.12);
    border-color: var(--white);
}

.btn-outline-white {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
}
.btn-outline-white:hover {
    background: var(--white);
    color: var(--blue-mid);
}

/* ---- Navbar ---- */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--blue-dark);
    box-shadow: 0 2px 16px rgba(0,0,0,0.18);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.logo {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.3px;
}

.logo-icon {
    color: var(--cyan);
    font-size: 1.4rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
    list-style: none;
}

.nav-links a {
    color: rgba(255,255,255,0.82);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 6px;
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--white);
    background: rgba(255,255,255,0.08);
}

.btn-nav {
    background: var(--blue-accent);
    color: var(--white) !important;
    padding: 9px 20px !important;
    border-radius: 8px !important;
}
.btn-nav:hover {
    background: var(--blue-light) !important;
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---- Hero ---- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-mid) 60%, #0d3b72 100%);
    padding-top: 68px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 700px;
    height: 700px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,200,232,0.12) 0%, transparent 70%);
    top: -200px;
    right: -200px;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 680px;
    padding: 60px 24px;
}

.hero-badge {
    display: inline-block;
    background: rgba(0,200,232,0.15);
    color: var(--cyan);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 6px 16px;
    border-radius: 20px;
    border: 1px solid rgba(0,200,232,0.25);
    margin-bottom: 20px;
}

.hero-content h1 {
    font-size: clamp(2.6rem, 6vw, 4rem);
    font-weight: 800;
    color: var(--white);
    line-height: 1.15;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.75);
    margin-bottom: 36px;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 56px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat strong {
    font-size: 2rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
}

.stat span {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.55);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

/* ---- Cards Grid ---- */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 28px;
}

.card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--blue-accent), var(--cyan));
    transform: scaleX(0);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-4px);
    border-color: transparent;
}

.card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
    display: block;
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.card p {
    color: var(--gray-text);
    font-size: 0.93rem;
    margin-bottom: 18px;
}

.card-link {
    color: var(--blue-accent);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    transition: var(--transition);
}

.card-link:hover {
    color: var(--blue-light);
}

/* ---- Why Us ---- */
.why-us {
    background: var(--gray-light);
}

.why-us-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.why-us-text .section-label { margin-bottom: 10px; }

.why-us-text h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 14px;
    line-height: 1.3;
}

.why-us-text > p {
    color: var(--gray-text);
    margin-bottom: 32px;
}

.features-list {
    list-style: none;
    margin-bottom: 36px;
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.features-list li {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feature-icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    background: var(--blue-accent);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    margin-top: 2px;
}

.features-list strong {
    display: block;
    font-size: 0.95rem;
    color: var(--text-dark);
    margin-bottom: 3px;
}

.features-list p {
    font-size: 0.88rem;
    color: var(--gray-text);
    margin: 0;
}

.why-us-image {
    display: flex;
    justify-content: center;
}

.image-placeholder {
    width: 100%;
    max-width: 420px;
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--blue-mid), var(--blue-accent));
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 4rem;
    gap: 12px;
    box-shadow: 0 12px 40px rgba(14, 42, 92, 0.25);
}

.image-placeholder p {
    font-size: 1rem;
    font-weight: 600;
    color: rgba(255,255,255,0.8);
}

/* ---- Brands ---- */
.brands-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}

.brand-badge {
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 16px 32px;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-dark);
    transition: var(--transition);
    cursor: default;
}

.brand-badge:hover {
    border-color: var(--blue-accent);
    color: var(--blue-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* ---- Testimonials ---- */
.testimonials {
    background: var(--gray-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.testimonial-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px 28px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.stars {
    color: #f59e0b;
    font-size: 1.1rem;
    margin-bottom: 14px;
}

.testimonial-card p {
    color: var(--gray-text);
    font-size: 0.93rem;
    font-style: italic;
    margin-bottom: 20px;
    line-height: 1.7;
}

.testimonial-author strong {
    display: block;
    color: var(--text-dark);
    font-weight: 700;
}

.testimonial-author span {
    font-size: 0.82rem;
    color: var(--blue-accent);
}

/* ---- CTA Banner ---- */
.cta-banner {
    background: linear-gradient(135deg, var(--blue-mid) 0%, var(--blue-accent) 100%);
    padding: 72px 0;
    text-align: center;
}

.cta-banner h2 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 12px;
}

.cta-banner p {
    color: rgba(255,255,255,0.8);
    font-size: 1.05rem;
    margin-bottom: 36px;
}

.cta-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---- Footer ---- */
.footer {
    background: var(--blue-dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 48px;
}

.footer-brand .logo {
    margin-bottom: 14px;
    display: inline-flex;
}

.footer-brand p {
    font-size: 0.88rem;
    line-height: 1.7;
    max-width: 280px;
}

.footer-links h4,
.footer-contact h4 {
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer-contact p {
    font-size: 0.9rem;
    margin-bottom: 8px;
    line-height: 1.5;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 18px 24px;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* ---- Services Page ---- */
.page-hero {
    background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-mid) 100%);
    padding: 120px 0 70px;
    text-align: center;
    color: var(--white);
}

.page-hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 14px;
}

.page-hero p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.75);
    max-width: 560px;
    margin: 0 auto;
}

.services-list {
    padding: 80px 0;
}

.service-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.service-item.reverse { direction: rtl; }
.service-item.reverse > * { direction: ltr; }

.service-img {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--blue-mid), var(--blue-light));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    box-shadow: 0 12px 40px rgba(14,42,92,0.2);
}

.service-text .section-label { margin-bottom: 10px; }

.service-text h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 14px;
}

.service-text p {
    color: var(--gray-text);
    margin-bottom: 14px;
}

.service-text ul {
    list-style: none;
    margin-bottom: 28px;
}

.service-text ul li {
    color: var(--gray-text);
    font-size: 0.93rem;
    padding: 5px 0;
    padding-left: 22px;
    position: relative;
}

.service-text ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--blue-accent);
    font-weight: 700;
}

/* ---- About Page ---- */
.about-story {
    padding: 80px 0;
}

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

.about-text h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.about-text p {
    color: var(--gray-text);
    margin-bottom: 16px;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.value-card {
    text-align: center;
    padding: 32px 24px;
    background: var(--gray-light);
    border-radius: var(--radius);
}

.value-card .icon { font-size: 2.4rem; margin-bottom: 14px; display: block; }
.value-card h3 { font-size: 1rem; font-weight: 700; color: var(--text-dark); margin-bottom: 8px; }
.value-card p { font-size: 0.88rem; color: var(--gray-text); }

/* ---- Contact Page ---- */
.contact-section {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 56px;
    align-items: start;
}

.contact-info h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 14px;
}

.contact-info > p {
    color: var(--gray-text);
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.contact-item .icon {
    width: 44px;
    height: 44px;
    background: rgba(26,111,181,0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    color: var(--text-dark);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.contact-item p, .contact-item a {
    font-size: 0.9rem;
    color: var(--gray-text);
    text-decoration: none;
}

.contact-item a:hover { color: var(--blue-accent); }

/* Contact Form */
.contact-form-box {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow);
}

.contact-form-box h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 28px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

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

.form-group label {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 7px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 0.93rem;
    font-family: inherit;
    color: var(--text-dark);
    background: var(--white);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--blue-accent);
    box-shadow: 0 0 0 3px rgba(26, 111, 181, 0.1);
}

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

.alert {
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.92rem;
    font-weight: 500;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #15803d;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #b91c1c;
}

.btn-full { width: 100%; text-align: center; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
    .why-us-grid,
    .about-grid,
    .service-item,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .service-item.reverse { direction: ltr; }

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

    .why-us-image { order: -1; }
}

@media (max-width: 640px) {
    .section { padding: 56px 0; }
    .section-header { margin-bottom: 36px; }
    .section-header h2 { font-size: 1.7rem; }

    .hero-stats { gap: 24px; }

    .form-row { grid-template-columns: 1fr; }

    .footer-grid { grid-template-columns: 1fr; gap: 32px; }

    .nav-toggle { display: flex; }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--blue-dark);
        padding: 16px 24px 24px;
        gap: 4px;
        border-top: 1px solid rgba(255,255,255,0.08);
    }

    .nav-links.open { display: flex; }

    .nav-links li { width: 100%; }

    .nav-links a {
        display: block;
        width: 100%;
    }

    .btn-nav { margin-top: 8px; }

    .contact-form-box { padding: 24px; }

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