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

:root {
    --bg: #170a0c;
    --card: #211015;
    --card-2: #2b161b;
    --border: rgba(255, 90, 90, .16);
    --text: #f2f4f8;
    --text-light: #b09a9a;
    --accent: #ff4d4d;
    --accent-2: #ff7a3d;
    --glow: rgba(255, 77, 77, .22);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background:
        radial-gradient(60% 45% at 85% -5%, rgba(255, 77, 77, .16), transparent 60%),
        radial-gradient(50% 40% at 0% 110%, rgba(255, 122, 61, .12), transparent 60%),
        var(--bg);
    color: var(--text);
    line-height: 1.65;
    min-height: 100vh;
    letter-spacing: .1px;
}

.container {
    max-width: 940px;
    margin: 0 auto;
    padding: 24px;
}

header {
    text-align: center;
    padding: 72px 24px;
    background:
        radial-gradient(60% 120% at 50% 0%, rgba(255, 77, 77, .18), transparent 70%),
        var(--card);
    border: 1px solid var(--border);
    border-radius: 24px;
    margin-bottom: 28px;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

header::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 24px;
    padding: 1px;
    background: linear-gradient(135deg, rgba(255,77,77,.6), rgba(255,150,60,.35), transparent 60%);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
    position: relative;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255,77,77,.25), rgba(255,150,60,.15));
    padding: 14px;
    border-radius: 18px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(255, 77, 77, .25);
}

.logo-icon img {
    width: 46px;
    height: 46px;
    display: block;
}

h1 {
    font-size: 44px;
    font-weight: 800;
    letter-spacing: -.5px;
    background: linear-gradient(135deg, #ffffff, #ffb3b3);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.subtitle {
    font-size: 17px;
    color: var(--text-light);
    font-weight: 300;
    letter-spacing: .3px;
    position: relative;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 36px;
    padding: 14px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    backdrop-filter: blur(8px);
}

.nav-link {
    padding: 9px 18px;
    text-decoration: none;
    color: var(--text-light);
    border-radius: 999px;
    font-weight: 600;
    font-size: 13.5px;
    letter-spacing: .2px;
    transition: all .25s;
    border: 1px solid transparent;
}

.nav-link:hover {
    color: #fff;
    border-color: var(--border);
    background: var(--card-2);
    box-shadow: 0 0 24px var(--glow);
}

section {
    margin-bottom: 36px;
}

h2 {
    font-size: 26px;
    margin-bottom: 18px;
    letter-spacing: -.3px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
}

h2::before {
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 0 16px var(--glow);
    transform: rotate(45deg);
}

.card {
    background: var(--card);
    padding: 30px;
    border-radius: 18px;
    border: 1px solid var(--border);
    backdrop-filter: blur(8px);
    transition: border-color .25s, transform .25s, box-shadow .25s;
}

.card:hover {
    border-color: rgba(255, 77, 77, .45);
    transform: translateY(-2px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, .4), 0 0 32px var(--glow);
}

h3 {
    font-size: 19px;
    margin: 26px 0 14px;
    color: var(--text);
    font-weight: 700;
    letter-spacing: -.2px;
}

h3:first-child {
    margin-top: 0;
}

p {
    margin-bottom: 15px;
    color: var(--text-light);
}

ul, ol {
    margin: 15px 0;
    padding-left: 20px;
}

li {
    margin-bottom: 10px;
    color: var(--text-light);
}

li strong {
    color: var(--text);
}

.highlight {
    background: linear-gradient(135deg, rgba(255, 77, 77, .14), rgba(255, 122, 61, .08));
    padding: 20px;
    border-radius: 14px;
    border: 1px solid rgba(255, 77, 77, .3);
    margin: 20px 0;
}

.highlight strong {
    color: #ffb3b3;
}

.warning {
    background: linear-gradient(135deg, rgba(255, 170, 80, .12), rgba(255, 120, 60, .07));
    padding: 20px;
    border-radius: 14px;
    border: 1px solid rgba(255, 170, 80, .3);
    margin: 20px 0;
}

.warning strong {
    color: #ffb677;
}

.steps {
    list-style: none;
    padding: 0;
}

.steps li {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    align-items: flex-start;
}

.steps.compact li {
    margin-bottom: 15px;
}

.step-number {
    flex-shrink: 0;
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #0b0c10;
    font-weight: 800;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    box-shadow: 0 8px 24px rgba(255, 77, 77, .4);
}

.step-content {
    flex: 1;
}

.step-content strong {
    display: block;
    margin-bottom: 5px;
    color: var(--text);
}

.step-content p {
    margin: 0;
}

.form-example {
    background: var(--card-2);
    padding: 20px;
    border-radius: 14px;
    margin: 15px 0;
    border: 1px solid var(--border);
}

.form-field {
    display: flex;
    gap: 15px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

.form-field:last-child {
    border-bottom: none;
}

.form-field label {
    font-weight: 600;
    min-width: 180px;
    color: var(--text);
}

.form-value {
    color: #ffb0b0;
    font-family: 'Consolas', monospace;
    background: rgba(255, 77, 77, .1);
    padding: 2px 10px;
    border-radius: 6px;
    border: 1px solid rgba(255, 77, 77, .35);
}

.interface-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 20px 0;
}

.interface-item {
    background: var(--card-2);
    padding: 22px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border);
    transition: transform .25s, border-color .25s, box-shadow .25s;
}

.interface-item:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 122, 61, .45);
    box-shadow: 0 0 28px rgba(255, 77, 77, .2);
}

.interface-icon {
    font-size: 34px;
    margin-bottom: 10px;
}

.interface-item h4 {
    margin-bottom: 8px;
    color: var(--text);
    font-weight: 700;
}

.interface-item p {
    margin: 0;
    font-size: 14px;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin: 15px 0;
}

.tip-item {
    background: var(--card-2);
    padding: 16px;
    border-radius: 14px;
    border: 1px solid var(--border);
    transition: border-color .25s, transform .25s, box-shadow .25s;
}

.tip-item:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 77, 77, .45);
    box-shadow: 0 0 24px var(--glow);
}

.tip-item strong {
    display: block;
    margin-bottom: 5px;
    color: var(--text);
    font-weight: 700;
}

.tip-item p {
    margin: 0;
    font-size: 14px;
}

code {
    background: var(--card-2);
    padding: 2px 7px;
    border-radius: 6px;
    font-family: 'Consolas', monospace;
    font-size: 14px;
    color: var(--accent-2);
    border: 1px solid var(--border);
}

.tips-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tip {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: var(--card-2);
    border-radius: 14px;
    align-items: flex-start;
    border: 1px solid var(--border);
    transition: border-color .25s, transform .25s, box-shadow .25s;
}

.tip:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 77, 77, .45);
    box-shadow: 0 0 24px var(--glow);
}

.tip-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.tip strong {
    display: block;
    margin-bottom: 5px;
    color: var(--text);
    font-weight: 700;
}

.tip p {
    margin: 0;
}

footer {
    text-align: center;
    padding: 30px;
    color: var(--text-light);
    font-size: 14px;
}

footer a {
    color: #ffb0b0;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: .2px;
    transition: color .2s;
}

footer a:hover {
    color: var(--accent-2);
}

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

    header {
        padding: 44px 16px;
    }

    h1 {
        font-size: 30px;
    }

    .logo-icon {
        padding: 10px;
    }

    .logo-icon img {
        width: 36px;
        height: 36px;
    }

    nav {
        padding: 12px;
    }

    .nav-link {
        padding: 8px 14px;
        font-size: 13px;
    }

    .interface-grid,
    .tips-grid {
        grid-template-columns: 1fr;
    }

    .form-field {
        flex-direction: column;
        gap: 5px;
    }

    .form-field label {
        min-width: auto;
    }

    h2 {
        font-size: 21px;
    }
}