/* ===== CSS Variables & Reset ===== */
:root {
    --primary: #f5a623;
    --primary-dark: #d48f1a;
    --bg-dark: #0f0f1a;
    --bg-card: rgba(255, 255, 255, 0.06);
    --bg-card-hover: rgba(255, 255, 255, 0.10);
    --text-primary: #f0f0f5;
    --text-secondary: #b0b0c0;
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.15);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --radius: 16px;
    --transition: 0.3s ease;
    --max-width: 1200px;
    --font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* Light mode (optional) – we keep dark as default but add a light variant */
@media (prefers-color-scheme: light) {
    :root {
        --bg-dark: #f4f4f9;
        --bg-card: rgba(0, 0, 0, 0.04);
        --bg-card-hover: rgba(0, 0, 0, 0.08);
        --text-primary: #1a1a2e;
        --text-secondary: #4a4a5e;
        --glass-bg: rgba(255, 255, 255, 0.7);
        --glass-border: rgba(0, 0, 0, 0.1);
        --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== Skip & Back to Top ===== */
.skip-link {
    position: absolute;
    top: -100px;
    left: 16px;
    background: var(--primary);
    color: #000;
    padding: 8px 16px;
    border-radius: 0 0 8px 8px;
    z-index: 1000;
    transition: top 0.3s;
    font-weight: 600;
    text-decoration: none;
}
.skip-link:focus {
    top: 0;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: #000;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(245, 166, 35, 0.3);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s forwards 1s;
    z-index: 999;
    transition: background 0.3s, transform 0.3s;
}
.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

/* ===== Header & Navigation ===== */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    background: rgba(15, 15, 26, 0.7);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}
.logo svg {
    flex-shrink: 0;
}
.logo-text {
    letter-spacing: 1px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 28px;
}
.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding-bottom: 4px;
    transition: color var(--transition);
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}
.nav-links a:hover {
    color: var(--primary);
}
.nav-links a:hover::after {
    width: 100%;
}

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 4px;
    transition: all 0.3s;
}

/* ===== Hero Section (Gradient Banner) ===== */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 24px 60px;
    gap: 40px;
    flex-wrap: wrap;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    border-radius: 0 0 40px 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    margin-bottom: 60px;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(245, 166, 35, 0.08), transparent 60%);
    pointer-events: none;
}
.hero-content {
    flex: 1 1 400px;
    animation: fadeInUp 0.8s ease;
}
.hero-content h1 {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    background: linear-gradient(to right, #f5a623, #f7c948);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 28px;
    max-width: 480px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 40px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    border: 2px solid transparent;
}
.btn-primary {
    background: var(--primary);
    color: #000;
    box-shadow: 0 4px 20px rgba(245, 166, 35, 0.3);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(245, 166, 35, 0.4);
}
.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--glass-border);
    backdrop-filter: blur(4px);
}
.btn-secondary:hover {
    background: var(--glass-bg);
    border-color: var(--primary);
    transform: translateY(-3px);
}
.hero-visual {
    flex: 0 0 300px;
    display: flex;
    justify-content: center;
    animation: float 6s ease-in-out infinite;
}
.hero-visual svg {
    max-width: 100%;
    height: auto;
}

/* ===== Section Common ===== */
section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 24px;
    scroll-margin-top: 80px;
}
.section-header {
    text-align: center;
    margin-bottom: 48px;
}
.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(to right, var(--primary), #f7c948);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* ===== About Grid ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.about-grid article {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 32px 24px;
    transition: transform 0.4s, box-shadow 0.4s, background 0.3s;
    box-shadow: var(--shadow);
}
.about-grid article:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
    background: var(--bg-card-hover);
}
.about-grid h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--primary);
}
.about-grid p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Products ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.product-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: transform 0.4s, box-shadow 0.4s, background 0.3s;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
}
.product-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    background: var(--bg-card-hover);
}
.product-card h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: var(--primary);
}
.product-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex: 1;
}
.product-link {
    display: inline-block;
    padding: 8px 24px;
    border-radius: 30px;
    background: var(--primary);
    color: #000;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.3s, transform 0.3s;
}
.product-link:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* ===== Services ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}
.services-grid article {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 28px 20px;
    transition: transform 0.3s, background 0.3s;
    box-shadow: var(--shadow);
}
.services-grid article:hover {
    transform: translateY(-6px);
    background: var(--bg-card-hover);
}
.services-grid h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--primary);
}
.services-grid p {
    color: var(--text-secondary);
}

/* ===== Insights ===== */
.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.insights-grid article {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 28px 20px;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: var(--shadow);
}
.insights-grid article:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
}
.insights-grid h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.insights-grid p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}
.insights-grid time {
    font-size: 0.85rem;
    color: var(--primary);
    display: block;
}

/* ===== FAQ ===== */
.faq-list {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
details {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 16px 20px;
    transition: background 0.3s;
    box-shadow: var(--shadow);
    cursor: pointer;
}
details[open] {
    background: var(--bg-card-hover);
}
summary {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--text-primary);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
summary::-webkit-details-marker {
    display: none;
}
summary::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--primary);
    transition: transform 0.3s;
}
details[open] summary::after {
    content: '−';
    transform: rotate(180deg);
}
details p {
    margin-top: 12px;
    color: var(--text-secondary);
    line-height: 1.7;
    padding-top: 8px;
    border-top: 1px solid var(--glass-border);
}

/* ===== HowTo ===== */
.howto-steps {
    max-width: 640px;
    margin: 0 auto;
    list-style: decimal;
    padding-left: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.howto-steps li {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 16px 20px 16px 32px;
    box-shadow: var(--shadow);
    color: var(--text-secondary);
    transition: transform 0.3s;
}
.howto-steps li:hover {
    transform: translateX(6px);
}
.howto-steps strong {
    color: var(--primary);
}

/* ===== Contact ===== */
.contact-details {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 32px 28px;
    max-width: 520px;
    margin: 0 auto;
    box-shadow: var(--shadow);
    font-style: normal;
    text-align: center;
}
.contact-details p {
    margin-bottom: 8px;
    color: var(--text-secondary);
}
.contact-details a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s;
}
.contact-details a:hover {
    text-decoration: underline;
    color: var(--primary-dark);
}

/* ===== Footer ===== */
footer {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--glass-border);
    padding: 40px 24px 20px;
    margin-top: 60px;
}
.footer-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 32px;
    margin-bottom: 24px;
}
.footer-grid h3 {
    font-size: 1rem;
    color: var(--primary);
    margin-bottom: 12px;
}
.footer-grid p,
.footer-grid li {
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.footer-grid ul {
    list-style: none;
}
.footer-grid a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}
.footer-grid a:hover {
    color: var(--primary);
}
.footer-bottom {
    text-align: center;
    border-top: 1px solid var(--glass-border);
    padding-top: 20px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* Scroll-triggered animation (all sections fade in) */
section {
    animation: fadeInUp 0.7s ease both;
}
/* Stagger children */
section:nth-child(2) { animation-delay: 0.1s; }
section:nth-child(3) { animation-delay: 0.2s; }
section:nth-child(4) { animation-delay: 0.3s; }
section:nth-child(5) { animation-delay: 0.4s; }
section:nth-child(6) { animation-delay: 0.5s; }
section:nth-child(7) { animation-delay: 0.6s; }
section:nth-child(8) { animation-delay: 0.7s; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        background: rgba(15, 15, 26, 0.95);
        backdrop-filter: blur(20px);
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        padding: 20px 24px;
        border-bottom: 1px solid var(--glass-border);
        gap: 16px;
    }
    .nav-links.active {
        display: flex;
    }
    .nav-toggle {
        display: flex;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        padding: 60px 20px 40px;
    }
    .hero-content h1 {
        font-size: 2rem;
    }
    .hero-actions {
        justify-content: center;
    }
    .hero-visual {
        flex-basis: auto;
        width: 200px;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .about-grid,
    .products-grid,
    .services-grid,
    .insights-grid {
        grid-template-columns: 1fr;
    }

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

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.6rem;
    }
    .hero-content p {
        font-size: 0.95rem;
    }
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    .nav-container {
        padding: 10px 16px;
    }
    section {
        padding: 40px 16px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}