/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: rgba(26, 26, 46, 0.7);
    --text-primary: #f0f0f5;
    --text-secondary: #b0b0c0;
    --accent: #e94560;
    --accent-hover: #ff6b81;
    --gradient-bg: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #16213e 100%);
    --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #e94560 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --nav-height: 70px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent-hover);
}

img, svg {
    max-width: 100%;
    display: block;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* ===== Selection ===== */
::selection {
    background: var(--accent);
    color: #fff;
}

/* ===== Animation Keyframes ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== Header / Navigation ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    height: var(--nav-height);
    transition: var(--transition);
}

header:hover {
    background: rgba(15, 15, 26, 0.95);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.logo svg {
    height: 40px;
    width: auto;
}

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

.nav-menu li a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
    border-radius: 2px;
}

.nav-menu li a:hover {
    color: var(--text-primary);
    background: var(--glass-bg);
}

.nav-menu li a:hover::after {
    width: 60%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    gap: 5px;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero Section ===== */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-bg);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    position: relative;
    overflow: hidden;
    padding: 120px 20px 80px;
}

#hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 30%, rgba(233, 69, 96, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 70%, rgba(26, 26, 46, 0.3) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    text-align: center;
    animation: fadeInUp 1s ease forwards;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: -0.5px;
}

.hero-content p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.btn-primary {
    display: inline-block;
    padding: 16px 40px;
    background: var(--gradient-hero);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
    border: none;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(233, 69, 96, 0.6);
    color: #fff;
}

.btn-primary:active {
    transform: translateY(-1px);
}

/* ===== Section Common ===== */
section {
    padding: 100px 20px;
    max-width: var(--max-width);
    margin: 0 auto;
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

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; }

h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
}

h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--accent);
    margin: 12px auto 0;
    border-radius: 3px;
}

section p {
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 20px;
    text-align: center;
    font-size: 1.05rem;
    line-height: 1.8;
}

/* ===== About Section ===== */
#about {
    text-align: center;
}

#about p {
    text-align: left;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 20px;
}

/* ===== Products Grid ===== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.product-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 40px 30px;
    transition: var(--transition);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(233, 69, 96, 0.05) 100%);
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
    border-color: rgba(233, 69, 96, 0.3);
}

.product-card:hover::before {
    opacity: 1;
}

.product-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.product-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    text-align: left;
    position: relative;
    z-index: 1;
}

/* ===== Solutions List ===== */
.solution-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.solution-item {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 35px 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.solution-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-hero);
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

.solution-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow);
}

.solution-item:hover::after {
    transform: scaleX(1);
}

.solution-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.solution-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    text-align: left;
}

/* ===== Resources Grid ===== */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.resource-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: 30px 25px;
    transition: var(--transition);
}

.resource-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow);
    border-color: rgba(233, 69, 96, 0.2);
}

.resource-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.resource-card h3 a {
    color: var(--text-primary);
    transition: var(--transition);
}

.resource-card h3 a:hover {
    color: var(--accent);
}

.resource-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: left;
}

/* ===== HowTo Section ===== */
#howto ol {
    max-width: 800px;
    margin: 30px auto;
    padding: 0 20px;
    list-style: none;
    counter-reset: howto-counter;
}

#howto ol li {
    counter-increment: howto-counter;
    padding: 18px 20px 18px 60px;
    margin-bottom: 15px;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    position: relative;
    transition: var(--transition);
    color: var(--text-secondary);
    line-height: 1.7;
}

#howto ol li::before {
    content: counter(howto-counter);
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background: var(--gradient-hero);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
}

#howto ol li:hover {
    transform: translateX(8px);
    border-color: rgba(233, 69, 96, 0.3);
}

#howto ol li strong {
    color: var(--text-primary);
}

/* ===== FAQ Section ===== */
.faq-list {
    max-width: 800px;
    margin: 30px auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(233, 69, 96, 0.2);
}

.faq-item summary {
    padding: 18px 25px;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    list-style: none;
    transition: var(--transition);
    user-select: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--accent);
    transition: var(--transition);
    font-weight: 300;
}

.faq-item[open] summary::after {
    content: '−';
    transform: rotate(180deg);
}

.faq-item[open] summary {
    border-bottom: 1px solid var(--glass-border);
}

.faq-item p {
    padding: 18px 25px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    text-align: left;
    margin: 0;
    animation: fadeInScale 0.3s ease;
}

/* ===== Contact Section ===== */
#contact address {
    max-width: 600px;
    margin: 30px auto;
    padding: 40px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    font-style: normal;
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

#contact address p {
    text-align: left;
    margin: 0;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

#contact address p:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
}

/* ===== Footer ===== */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--glass-border);
    padding: 40px 20px;
    margin-top: 60px;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.footer-content a {
    color: var(--text-secondary);
    margin: 0 8px;
    transition: var(--transition);
}

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

/* ===== Back to Top ===== */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-hero);
    color: #fff;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
    transition: var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(233, 69, 96, 0.6);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    section {
        padding: 80px 20px;
    }

    .product-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(15, 15, 26, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 10px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        border-bottom: 1px solid var(--glass-border);
        box-shadow: var(--shadow);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li a {
        display: block;
        padding: 14px 20px;
        font-size: 1.1rem;
        border-radius: var(--radius-sm);
    }

    .nav-toggle {
        display: flex;
    }

    #hero {
        min-height: 80vh;
        padding: 100px 20px 60px;
    }

    .hero-content h1 {
        font-size: clamp(1.8rem, 6vw, 2.5rem);
    }

    section {
        padding: 60px 20px;
    }

    h2 {
        font-size: 1.8rem;
        white-space: normal;
        display: block;
        left: 0;
        transform: none;
    }

    .product-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .solution-list {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .resource-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    #howto ol li {
        padding: 16px 16px 16px 55px;
        font-size: 0.95rem;
    }

    #howto ol li::before {
        width: 28px;
        height: 28px;
        font-size: 0.8rem;
        left: 12px;
    }

    #contact address {
        padding: 25px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    #back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
        font-size: 1.3rem;
    }
}

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

    .logo svg {
        height: 32px;
    }

    #hero {
        min-height: 70vh;
        padding: 90px 15px 50px;
    }

    .hero-content h1 {
        font-size: 1.6rem;
    }

    .hero-content p {
        font-size: 0.95rem;
    }

    .btn-primary {
        padding: 14px 30px;
        font-size: 1rem;
    }

    section {
        padding: 50px 15px;
    }

    h2 {
        font-size: 1.5rem;
    }

    .product-card, .solution-item, .resource-card {
        padding: 25px 20px;
    }

    #contact address {
        padding: 20px;
    }

    #contact address p {
        padding: 10px 15px;
        font-size: 0.9rem;
    }

    .faq-item summary {
        padding: 14px 18px;
        font-size: 0.95rem;
    }

    .faq-item p {
        padding: 14px 18px;
    }

    #back-to-top {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
        bottom: 15px;
        right: 15px;
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ===== High Contrast / Accessibility ===== */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #ffffff;
        --text-secondary: #e0e0e0;
        --accent: #ff3366;
        --glass-bg: rgba(0, 0, 0, 0.8);
        --glass-border: rgba(255, 255, 255, 0.3);
    }
}

/* ===== Focus Visible ===== */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ===== Print Styles ===== */
@media print {
    header, #back-to-top, .nav-toggle {
        display: none;
    }

    body {
        background: #fff;
        color: #000;
    }

    section {
        padding: 20px 0;
        page-break-inside: avoid;
    }

    .product-card, .solution-item, .resource-card, .faq-item, #contact address {
        background: #f5f5f5;
        border: 1px solid #ccc;
        backdrop-filter: none;
    }

    a {
        color: #000;
        text-decoration: underline;
    }
}