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

body {
    background: #000;
    color: #d4d4d4;
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    line-height: 1.65;
    padding: 0;
    font-size: 15px;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: -15%;
    left: -5%;
    width: 110%;
    height: 130%;
    background-image: url('background.jpg');
    background-size: cover;
    background-position: center top;
    background-repeat: no-repeat;
    will-change: transform;
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: -1;
    pointer-events: none;
}

/* Top Navigation */
.top-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 16px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: #fff;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    font-size: 24px;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: #a8a8a8;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #0a84ff;
    transition: width 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: #fff;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.lang-switch {
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.lang-switch:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 30px 20px;
}

.fade-element {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-element.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-element.hidden {
    opacity: 0;
    transform: translateY(30px);
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 25px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0;
    animation: headerFadeIn 1s ease-out forwards;
}

@keyframes headerFadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header h1 {
    color: #fff;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.header p {
    color: #888;
    font-size: 14px;
    font-weight: 400;
}

.nav {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 20px 24px;
    border-radius: 16px;
    margin-bottom: 35px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.nav:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.nav h4 {
    color: #fff;
    margin-bottom: 14px;
    font-size: 13px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.6;
}

.nav a {
    color: #0a84ff;
    text-decoration: none;
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    transition: all 0.25s ease;
    padding-left: 2px;
}

.nav a:last-child {
    margin-bottom: 0;
}

.nav a::before {
    content: '→ ';
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.25s ease;
    display: inline-block;
}

.nav a:hover {
    color: #409cff;
    padding-left: 8px;
}

.nav a:hover::before {
    opacity: 1;
    transform: translateX(0);
}

.section {
    margin-bottom: 50px;
}

.section h3 {
    color: #fff;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 25px;
    letter-spacing: -0.01em;
}

.step {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 20px 24px;
    border-radius: 12px;
    margin: 18px 0;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.step:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateX(4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.step h4 {
    color: #fff;
    margin-bottom: 10px;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.step:hover h4 {
    color: #0a84ff;
}

.step p {
    color: #a8a8a8;
    font-size: 14px;
    line-height: 1.6;
}

.step strong {
    color: #fff;
    font-weight: 500;
}

.step-image {
    max-width: 100%;
    border-radius: 10px;
    margin-top: 16px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step-image:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.step-5 {
    background: linear-gradient(135deg, rgba(10, 132, 255, 0.1) 0%, rgba(10, 132, 255, 0.05) 100%);
    border-color: rgba(10, 132, 255, 0.25);
}

.step-5:hover {
    background: linear-gradient(135deg, rgba(10, 132, 255, 0.15) 0%, rgba(10, 132, 255, 0.08) 100%);
    border-color: rgba(10, 132, 255, 0.35);
}

.step-5 h4 {
    color: #0a84ff;
}

.step-5 p {
    color: #c4c4c4;
}

pre {
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: #0a84ff;
    padding: 14px 18px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 12px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    border: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 12px;
    transition: all 0.3s ease;
}

pre:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(10, 132, 255, 0.3);
}

img {
    max-width: 100%;
    border-radius: 10px;
    margin-top: 12px;
}

.app-list {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 16px 20px;
    border-radius: 10px;
    margin: 12px 0;
    border: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 14px;
    transition: all 0.3s ease;
}

.app-list:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateX(4px);
}

.app-list strong {
    color: #fff;
    margin-right: 10px;
    font-weight: 500;
}

.app-list a {
    color: #0a84ff;
    text-decoration: none;
    margin-right: 14px;
    transition: all 0.25s ease;
    position: relative;
}

.app-list a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: #0a84ff;
    transition: width 0.25s ease;
}

.app-list a:hover {
    color: #409cff;
}

.app-list a:hover::after {
    width: 100%;
}

.app-list span {
    color: #666;
    font-size: 13px;
}

a {
    color: #0a84ff;
    transition: color 0.2s ease;
}

a:hover {
    color: #409cff;
}

.important {
    background: rgba(255, 159, 10, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 20px 24px;
    border-radius: 12px;
    border: 1px solid rgba(255, 159, 10, 0.2);
    transition: all 0.3s ease;
}

.important:hover {
    background: rgba(255, 159, 10, 0.12);
    border-color: rgba(255, 159, 10, 0.3);
    transform: translateY(-2px);
}

.important h3 {
    color: #ff9f0a;
    font-size: 16px;
    margin-bottom: 14px;
}

.important ul {
    padding-left: 20px;
    margin-top: 10px;
}

.important li {
    margin: 10px 0;
    color: #c4c4c4;
    font-size: 14px;
    transition: color 0.2s ease;
}

.important li:hover {
    color: #e0e0e0;
}

.important strong {
    color: #fff;
    font-weight: 500;
}

hr {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin: 50px 0;
}

.footer {
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 13px;
    margin-top: 50px;
    opacity: 0;
    animation: headerFadeIn 1s ease-out 0.3s forwards;
}

@media (max-width: 768px) {
    .nav-container {
        padding: 12px 20px;
    }

    .nav-links {
        gap: 16px;
    }

    .nav-links a {
        font-size: 13px;
    }

    .logo {
        font-size: 18px;
    }

    .logo-icon {
        font-size: 20px;
    }

    .container {
        padding: 20px 15px;
    }

    body {
        font-size: 14px;
    }

    .header h1 {
        font-size: 22px;
    }

    .section h3 {
        font-size: 18px;
    }

    .step {
        padding: 16px 18px;
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: 12px;
    }

    .nav-links a {
        font-size: 12px;
    }
}