html,body,div,span,h1,h2,h3,h4,h5,h6,p,a,img,ul,ol,li,form,label,input,textarea,button{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}
*{box-sizing:border-box}
ul,ol{list-style:none}
a{text-decoration:none}
img{max-width:100%;height:auto;display:block}

:root{
    --bg: #ffffff;
    --bg-soft: #f8fcff;
    --primary: #66a6ff;
    --primary-light: #89f7fe;
    --primary-dark: #5a95e8;
    --text: #1a2b3c;
    --text-muted: #5c6f82;
    --border: rgba(102, 166, 255, 0.25);
    --shadow: 0 4px 20px rgba(102, 166, 255, 0.12);
    --gradient: linear-gradient(135deg, #89f7fe 0%, #66a6ff 100%);
}

body{
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.md19-wrap{
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.md19-nav-header{
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow 0.3s ease;
}
.md19-nav-header.md19-scrolled{ box-shadow: var(--shadow); }

.md19-nav-top{
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    height: 56px;
    padding-top: 8px;
}
.md19-nav-logo{
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.03em;
}
.md19-nav-utils{
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
}
.md19-nav-utils a{ color: var(--text-muted); transition: color 0.2s; }
.md19-nav-utils a:hover{ color: var(--primary); }
.md19-nav-divider{ opacity: 0.5; user-select: none; }

.md19-nav-pill-wrap{
    padding: 0 24px 14px;
    display: flex;
    justify-content: center;
}
.md19-nav-pill{
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 4px;
    max-width: 1280px;
    padding: 10px 20px;
    background: var(--gradient);
    border-radius: 999px;
    box-shadow: 0 4px 16px rgba(102, 166, 255, 0.25);
}
.md19-nav-pill a{
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(255,255,255,0.95);
    border-radius: 999px;
    transition: background 0.2s, color 0.2s;
}
.md19-nav-pill a:hover{
    background: rgba(255,255,255,0.25);
    color: #fff;
}

.md19-nav-menu-btn{
    display: none;
    position: fixed;
    top: 16px;
    right: 20px;
    z-index: 101;
    width: 44px;
    height: 44px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--gradient);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: transform 0.2s;
}
.md19-nav-menu-btn span{
    display: block;
    width: 20px;
    height: 2px;
    background: #fff;
    border-radius: 1px;
    transition: 0.25s;
}
.md19-nav-header.md19-menu-open .md19-nav-menu-btn span:nth-child(1){
    transform: translateY(8px) rotate(45deg);
}
.md19-nav-header.md19-menu-open .md19-nav-menu-btn span:nth-child(2){ opacity: 0; }
.md19-nav-header.md19-menu-open .md19-nav-menu-btn span:nth-child(3){
    transform: translateY(-8px) rotate(-45deg);
}

.md19-nav-overlay{
    display: none;
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(0,0,0,0.4);
    opacity: 0;
    transition: opacity 0.3s;
}
.md19-nav-overlay.md19-open{
    display: block;
    opacity: 1;
}
@media (max-width: 900px){
    .md19-nav-utils{ right: 60px; }
    .md19-nav-pill-wrap{
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 100;
        padding: 80px 24px 24px;
        background: var(--bg);
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s, opacity 0.3s, visibility 0.3s;
    }
    .md19-nav-header.md19-menu-open .md19-nav-pill-wrap{
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .md19-nav-pill{
        flex-direction: column;
        background: var(--bg-soft);
        border: 1px solid var(--border);
        border-radius: 20px;
        box-shadow: var(--shadow);
        padding: 24px;
    }
    .md19-nav-pill a{
        color: var(--text);
        padding: 14px 20px;
        font-size: 16px;
        text-align: center;
        border-radius: 12px;
    }
    .md19-nav-pill a:hover{
        background: rgba(102, 166, 255, 0.12);
        color: var(--primary);
    }
    .md19-nav-menu-btn{ display: flex; }
}
@media (max-width: 500px){
    .md19-nav-logo{ font-size: 20px; }
    .md19-nav-utils{ display: none; }
}

.md19-hero{
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient);
    background-attachment: scroll;
    padding: 100px 24px 80px;
    text-align: center;
}
.md19-hero-inner{ max-width: 720px; margin: 0 auto; }
.md19-hero h1{
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
    color: #fff;
    line-height: 1.15;
    margin-bottom: 20px;
    text-shadow: 0 2px 20px rgba(0,0,0,0.08);
}
.md19-hero p{
    font-size: 18px;
    color: rgba(255,255,255,0.95);
    margin-bottom: 36px;
    line-height: 1.6;
}
.md19-hero-actions{
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.md19-hero-actions .md19-btn{
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 28px;
    border: none;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}
.md19-hero-actions .md19-btn-white{
    background: #fff;
    color: var(--primary);
}
.md19-hero-actions .md19-btn-white:hover{ transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.12); }
.md19-hero-actions .md19-btn-outline{
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.9);
}
.md19-hero-actions .md19-btn-outline:hover{ background: rgba(255,255,255,0.15); }

.md19-bento{
    padding: 80px 24px;
    background: var(--bg);
}
.md19-bento-grid{
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 1280px;
    margin: 0 auto;
}
.md19-bento-item{
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    transition: box-shadow 0.3s, border-color 0.3s;
}
.md19-bento-item:hover{
    box-shadow: var(--shadow);
    border-color: rgba(102, 166, 255, 0.4);
}
.md19-bento-item.md19-tall{ grid-row: span 2; display: flex; flex-direction: column; justify-content: center; }
.md19-bento-item .md19-icon{
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: 20px;
}
.md19-bento-item h3{ font-size: 20px; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.md19-bento-item p{ font-size: 15px; color: var(--text-muted); line-height: 1.6; }
@media (max-width: 700px){
    .md19-bento-grid{ grid-template-columns: 1fr; }
    .md19-bento-item.md19-tall{ grid-row: span 1; }
}

.md19-zigzag{
    padding: 60px 24px 80px;
    background: var(--bg-soft);
}
.md19-zigzag-section{
    max-width: 1280px;
    margin: 0 auto 80px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.md19-zigzag-section:last-child{ margin-bottom: 0; }
.md19-zigzag-section.md19-reverse{ direction: rtl; }
.md19-zigzag-section.md19-reverse > *{ direction: ltr; }
.md19-zigzag-image{
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.md19-zigzag-image img{ width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.md19-zigzag-text h2{ font-size: 28px; font-weight: 700; color: var(--text); margin-bottom: 16px; }
.md19-zigzag-text p{ font-size: 16px; color: var(--text-muted); line-height: 1.75; margin-bottom: 14px; }
@media (max-width: 800px){
    .md19-zigzag-section,
    .md19-zigzag-section.md19-reverse{ direction: ltr; grid-template-columns: 1fr; gap: 24px; }
}

.md19-page-header{
    padding: 100px 24px 48px;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
}
.md19-page-header-inner{
    max-width: 720px;
    margin: 0 auto;
    padding-left: 20px;
    border-left: 4px solid var(--primary);
}
.md19-page-header .md19-title-desc{ font-size: 13px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 6px; }
.md19-page-header .md19-title-main{ font-size: 32px; font-weight: 700; color: var(--text); }
.md19-page-body{
    padding: 48px 24px 80px;
    background: var(--bg);
}
.md19-container-narrow{
    max-width: 720px;
    margin: 0 auto;
}
.md19-article-content p{
    font-size: 16px;
    line-height: 1.8;
    color: var(--text);
    margin-bottom: 20px;
}
.md19-article-content .md19-article-image{
    width: 100%;
    max-width: 500px;
    margin: 32px auto;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.md19-article-content .md19-article-image img{ width: 100%; }

.md19-footer{
    background: var(--bg-soft);
    border-top: 1px solid var(--border);
    padding: 56px 24px 24px;
}
.md19-footer-grid{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    max-width: 1280px;
    margin: 0 auto 40px;
}
.md19-footer-col h3{
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
}
.md19-footer-col a,
.md19-footer-col p{
    font-size: 14px;
    color: var(--text-muted);
    line-height: 2;
    display: block;
}
.md19-footer-col a:hover{ color: var(--primary); }
.md19-footer-friendlinks .md19-footer-links{
    max-height: 200px;
    overflow: hidden;
    transition: max-height 0.4s ease;
}
.md19-footer-friendlinks.md19-is-expanded .md19-footer-links{ max-height: 2000px; }
.md19-friendlinks-toggle{
    margin-top: 12px;
    padding: 8px 16px;
    font-size: 13px;
    color: var(--primary);
    background: rgba(102, 166, 255, 0.1);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
.md19-friendlinks-toggle:hover{ background: rgba(102, 166, 255, 0.18); color: var(--primary-dark); }

.md19-footer-bottom{
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-muted);
}
.md19-footer-bottom a{ color: var(--primary); }
.md19-footer-bottom a:hover{ text-decoration: underline; }
.md19-footer-bottom span{ margin: 0 8px; }

@media (max-width: 900px){
    .md19-footer-grid{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 500px){
    .md19-footer-grid{ grid-template-columns: 1fr; }
}

.md19-form-page .md19-container-narrow{ max-width: 560px; }
.md19-form-group{ margin-bottom: 24px; }
.md19-form-group label{
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}
.md19-form-group input,
.md19-form-group textarea{
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg);
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.md19-form-group input:focus,
.md19-form-group textarea:focus{
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 166, 255, 0.15);
}
.md19-form-group textarea{ min-height: 140px; resize: vertical; }
.md19-form-submit{
    margin-top: 32px;
}
.md19-form-submit .md19-btn{
    width: 100%;
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    background: var(--gradient);
    color: #fff;
    transition: transform 0.2s, box-shadow 0.2s;
}
.md19-form-submit .md19-btn:hover{ transform: translateY(-2px); box-shadow: 0 8px 24px rgba(102, 166, 255, 0.35); }

body { background: #f8fcff; }
.md19-hero { padding: 5rem 2rem; min-height: 65vh; }
.md19-bento-item { border-radius: 20px; box-shadow: 0 4px 16px rgba(102,166,255,0.08); }