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

:root {
    --bg: #0a0a14;
    --bg-card: rgba(30, 30, 50, 0.75);
    --bg-card-hover: rgba(50, 50, 70, 0.85);
    --text: #e8e8f0;
    --text-light: #a0a0b8;
    --text-muted: #6a6a80;
    --accent: #f0b429;
    --accent-hover: #d49a1a;
    --accent-glow: rgba(240, 180, 41, 0.3);
    --nav-bg: rgba(10, 10, 20, 0.9);
    --nav-text: #ffffff;
    --border: rgba(255, 255, 255, 0.08);
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.6);
    --glass-bg: rgba(255, 255, 255, 0.04);
    --glass-border: rgba(255, 255, 255, 0.08);
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* ===== Base ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    overflow-x: hidden;
}

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

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

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.01em;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    margin-bottom: 0.75rem;
}

h2 {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    margin-bottom: 1.25rem;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 2px;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.6rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
    line-height: 1.7;
}

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

/* ===== Layout ===== */
.section-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.7s ease forwards;
}

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

/* ===== Header & Navigation ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--glass-border);
    transition: background var(--transition), box-shadow var(--transition);
}

header.sticky {
    background: rgba(10, 10, 20, 0.97);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0.7rem 1.5rem;
}

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

.logo:hover {
    transform: scale(1.02);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 0.25rem;
}

.nav-links a {
    color: var(--nav-text);
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: background var(--transition), color var(--transition);
    position: relative;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.nav-links a:hover,
.nav-links a.active {
    background: rgba(240, 180, 41, 0.12);
    color: var(--accent);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: 8px;
    transition: background var(--transition);
}

.mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

.mobile-menu-toggle span {
    display: block;
    width: 26px;
    height: 2.5px;
    background: #fff;
    margin: 6px 0;
    border-radius: 4px;
    transition: var(--transition);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ===== Hero Section ===== */
.hero {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    min-height: 90vh;
    padding: 7rem 1.5rem 3rem;
    background: linear-gradient(135deg, #0a0a14 0%, #15152a 40%, #1a1a30 70%, #0f0f1a 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 80%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(240, 180, 41, 0.06), transparent 70%);
    pointer-events: none;
    animation: heroGlow 6s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0, 0) scale(1); opacity: 0.5; }
    100% { transform: translate(10%, 5%) scale(1.2); opacity: 1; }
}

.hero-content {
    flex: 1 1 380px;
    max-width: 580px;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: clamp(2.2rem, 5.5vw, 3.5rem);
    line-height: 1.15;
}

.hero-content .highlight {
    color: var(--accent);
    text-shadow: 0 0 40px var(--accent-glow);
}

.hero-content p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
    max-width: 480px;
}

.hero-note {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
    margin-top: 0.75rem;
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent), #e6a800);
    color: #0f0f1a;
    padding: 0.85rem 2.5rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.05rem;
    transition: transform var(--transition), box-shadow var(--transition);
    margin-top: 0.75rem;
    box-shadow: 0 4px 20px var(--accent-glow);
    border: none;
    cursor: pointer;
    letter-spacing: 0.5px;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 40px var(--accent-glow);
}

.btn-secondary {
    display: inline-block;
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
    padding: 0.6rem 1.8rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: background var(--transition), color var(--transition), transform var(--transition);
    cursor: pointer;
}

.btn-secondary:hover {
    background: var(--accent);
    color: #0f0f1a;
    transform: translateY(-2px);
}

.hero-visual {
    flex: 1 1 300px;
    max-width: 400px;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 0 30px rgba(240, 180, 41, 0.15));
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* ===== Card Grid ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius);
    padding: 1.75rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--glass-border);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
    position: relative;
    overflow: hidden;
}

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

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    background: var(--bg-card-hover);
}

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

.card h3 {
    margin-bottom: 0.6rem;
    font-size: 1.15rem;
}

.card p {
    font-size: 0.92rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.card .btn-secondary {
    margin-top: 0.5rem;
}

/* ===== Advantage List ===== */
.advantage-list {
    list-style: none;
    padding: 0;
    display: grid;
    gap: 1rem;
}

.advantage-list li {
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    padding: 1.25rem 1.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    transition: transform var(--transition), background var(--transition);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.advantage-list li::before {
    content: '✦';
    color: var(--accent);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.advantage-list li:hover {
    transform: translateX(6px);
    background: var(--bg-card-hover);
}

.advantage-list li strong {
    color: var(--text);
    margin-right: 0.25rem;
}

/* ===== HowTo Steps ===== */
.howto-steps {
    list-style: none;
    padding: 0;
    counter-reset: step;
    display: grid;
    gap: 1rem;
}

.howto-steps li {
    counter-increment: step;
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    padding: 1.25rem 1.75rem 1.25rem 3.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    position: relative;
    transition: transform var(--transition), background var(--transition);
}

.howto-steps li::before {
    content: counter(step);
    position: absolute;
    left: 1rem;
    top: 1.25rem;
    width: 28px;
    height: 28px;
    background: var(--accent);
    color: #0f0f1a;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.howto-steps li:hover {
    transform: translateX(4px);
    background: var(--bg-card-hover);
}

.howto-steps li strong {
    color: var(--accent);
}

/* ===== FAQ ===== */
.faq-list {
    display: grid;
    gap: 0.75rem;
}

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

.faq-list details[open] {
    background: var(--bg-card-hover);
}

.faq-list summary {
    padding: 1.1rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color var(--transition);
    user-select: none;
}

.faq-list summary:hover {
    color: var(--accent);
}

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

.faq-list summary::after {
    content: '+';
    font-size: 1.3rem;
    transition: transform var(--transition);
    color: var(--accent);
    flex-shrink: 0;
    margin-left: 1rem;
}

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

.faq-list details p {
    padding: 0 1.5rem 1.25rem;
    margin: 0;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== Contact ===== */
address p {
    margin-bottom: 0.5rem;
    font-style: normal;
}

address a {
    font-weight: 500;
}

/* ===== Footer ===== */
footer {
    background: #080810;
    color: var(--text-muted);
    padding: 2.5rem 1.5rem;
    text-align: center;
    border-top: 1px solid var(--glass-border);
}

.footer-inner {
    max-width: 1120px;
    margin: 0 auto;
}

.footer-links {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
    transition: color var(--transition);
}

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

/* ===== Back to Top ===== */
#back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: linear-gradient(135deg, var(--accent), #e6a800);
    color: #0f0f1a;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: 0 4px 20px var(--accent-glow);
    transition: transform var(--transition), opacity var(--transition), box-shadow var(--transition);
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: center;
}

#back-to-top:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 40px var(--accent-glow);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        background: rgba(10, 10, 20, 0.98);
        backdrop-filter: blur(20px);
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        padding: 1rem 0;
        gap: 0.25rem;
        border-bottom: 1px solid var(--glass-border);
    }

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

    .nav-links a {
        padding: 0.75rem 1.5rem;
        border-radius: 0;
        font-size: 1rem;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 5rem;
        min-height: 80vh;
    }

    .hero-content p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-visual {
        max-width: 280px;
    }

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

    h2 {
        font-size: 1.5rem;
    }

    .section-inner {
        padding: 2.5rem 1.25rem;
    }

    .advantage-list li {
        padding: 1rem 1.25rem;
        font-size: 0.95rem;
    }

    .howto-steps li {
        padding: 1rem 1.25rem 1rem 3rem;
    }

    .howto-steps li::before {
        left: 0.75rem;
        top: 1rem;
        width: 24px;
        height: 24px;
        font-size: 0.8rem;
    }

    #back-to-top {
        bottom: 1.25rem;
        right: 1.25rem;
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }

    .btn-primary {
        padding: 0.7rem 2rem;
        font-size: 0.95rem;
    }

    .hero-visual {
        max-width: 220px;
    }

    .card {
        padding: 1.25rem;
    }
}

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

    .hero::before {
        animation: none;
    }

    .hero-visual {
        animation: none;
    }

    .section-inner {
        animation: none;
        opacity: 1;
        transform: none;
    }
}

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

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

::-webkit-scrollbar-thumb {
    background: rgba(240, 180, 41, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(240, 180, 41, 0.5);
}

/* ===== Selection ===== */
::selection {
    background: var(--accent);
    color: #0f0f1a;
}