*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;color:#1d1d1f;background:#fbfbfd;line-height:1.6;-webkit-font-smoothing:antialiased}
.container{max-width:1120px;margin:0 auto;padding:0 24px}
a{color:#0071e3;text-decoration:none}a:hover{text-decoration:underline}

/* Apple-style header */
.site-header{background:rgba(29,29,31,.9);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);position:sticky;top:0;z-index:1000;border-bottom:1px solid rgba(255,255,255,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:52px}
.logo{font-size:1.25rem;font-weight:700;color:#fff;letter-spacing:-.02em}
.logo span{color:#0071e3;font-weight:500}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav>a{color:rgba(255,255,255,.8);padding:0 16px;height:52px;display:flex;align-items:center;font-size:.87rem;transition:color .2s;text-decoration:none}
.main-nav>a:hover{color:#fff;text-decoration:none}
.nav-dd{position:relative}
.nav-dd>a{display:flex;align-items:center;gap:4px;cursor:pointer}
.nav-dd>a::after{content:'';border-left:4px solid transparent;border-right:4px solid transparent;border-top:4px solid rgba(255,255,255,.5);margin-top:1px}
.nav-dd-menu{display:none;position:absolute;top:100%;right:0;background:#fff;border-radius:12px;box-shadow:0 8px 40px rgba(0,0,0,.12);padding:8px;min-width:560px;z-index:1001}
.nav-dd:hover .nav-dd-menu{display:grid;grid-template-columns:repeat(3,1fr);gap:4px}
.nav-dd-menu strong{grid-column:1/-1;padding:8px 12px;font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:#86868b;margin-top:4px}
.nav-dd-menu a{color:#1d1d1f;padding:8px 12px;border-radius:8px;font-size:.87rem}
.nav-dd-menu a:hover{background:#f5f5f7;text-decoration:none}
.mob-toggle{display:none;background:none;border:none;color:#fff;font-size:1.3rem;cursor:pointer}
@media(max-width:860px){.mob-toggle{display:block}.main-nav{display:none;position:absolute;top:52px;left:0;right:0;background:rgba(29,29,31,.98);flex-direction:column;padding:8px 0}.main-nav.act{display:flex}.main-nav>a,.nav-dd>a{padding:14px 24px;height:auto}.nav-dd-menu{position:static;min-width:100%;box-shadow:none;display:none!important}.nav-dd.open .nav-dd-menu{display:block!important;grid-template-columns:1fr!important}}

/* Hero */
.hero{padding:100px 0 60px;text-align:center;background:linear-gradient(180deg,#fff 0%,#fbfbfd 100%)}
.hero h1{font-size:3.2rem;font-weight:700;letter-spacing:-.03em;line-height:1.1;margin-bottom:16px}
.hero h1 span{background:linear-gradient(135deg,#0071e3,#a855f7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:1.15rem;color:#86868b;max-width:560px;margin:0 auto 32px;line-height:1.5}
.hero .cta{display:inline-block;background:#0071e3;color:#fff;padding:12px 28px;border-radius:980px;font-size:.95rem;font-weight:500;transition:all .2s}
.hero .cta:hover{background:#0077ed;text-decoration:none;transform:scale(1.02)}

/* Stats */
.stats{display:flex;justify-content:center;gap:48px;padding:32px 0;margin-bottom:40px}
.stat{text-align:center}.stat b{display:block;font-size:2rem;font-weight:700;color:#1d1d1f}.stat span{font-size:.82rem;color:#86868b}

/* Tool grid */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.tool-card{background:#fff;border-radius:12px;padding:20px;border:1px solid #d2d2d7;transition:all .2s;cursor:pointer}
.tool-card:hover{box-shadow:0 4px 16px rgba(0,0,0,.06);transform:translateY(-1px)}
.tool-card .ic{font-size:1.8rem;margin-bottom:8px}
.tool-card h3{font-size:.95rem;font-weight:600;margin-bottom:4px}
.tool-card p{font-size:.82rem;color:#86868b;line-height:1.4}
.cat-tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:24px}
.cat-tab{padding:7px 16px;border-radius:980px;border:1px solid #d2d2d7;background:#fff;font-size:.82rem;cursor:pointer;transition:all .15s}
.cat-tab:hover,.cat-tab.on{background:#1d1d1f;color:#fff;border-color:#1d1d1f}

/* Converter tool page */
.conv-page{max-width:640px;margin:0 auto;padding:40px 20px}
.conv-page .icon{font-size:3rem;margin-bottom:12px;text-align:center}
.conv-page h1{font-size:1.8rem;font-weight:700;text-align:center;margin-bottom:4px}
.conv-page .badge{display:block;text-align:center;color:#86868b;font-size:.87rem;margin-bottom:32px}
.conv-box{background:#fff;border-radius:16px;padding:32px;box-shadow:0 2px 12px rgba(0,0,0,.04);border:1px solid #d2d2d7}
.conv-row{display:flex;gap:12px;align-items:center;margin-bottom:16px}
.conv-input{flex:1;padding:16px 20px;border:1px solid #d2d2d7;border-radius:12px;font-size:1.25rem;font-weight:600;font-family:inherit;transition:border .2s}
.conv-input:focus{outline:none;border-color:#0071e3;box-shadow:0 0 0 4px rgba(0,113,227,.12)}
.conv-swap{width:44px;height:44px;border-radius:50%;border:1px solid #d2d2d7;background:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.2rem;transition:all .15s;flex-shrink:0}
.conv-swap:hover{background:#fbfbfd;transform:rotate(180deg)}
.conv-result{text-align:center;padding:24px;background:linear-gradient(135deg,#0071e3,#5856d6);border-radius:12px;color:#fff;margin-top:16px}
.conv-result .val{font-size:2.5rem;font-weight:700;letter-spacing:-.02em}
.conv-result .unit{font-size:.95rem;opacity:.8;margin-top:4px}
.conv-formula{margin-top:20px;padding:16px;background:#f5f5f7;border-radius:10px;font-size:.87rem;color:#86868b;text-align:center}

/* Blog */
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px}
.blog-card{background:#fff;border-radius:14px;overflow:hidden;border:1px solid #d2d2d7;transition:all .2s}
.blog-card:hover{box-shadow:0 4px 20px rgba(0,0,0,.06);transform:translateY(-2px)}
.blog-card img{width:100%;height:200px;object-fit:cover}
.blog-card .inner{padding:20px}
.blog-card .tag{display:inline-block;background:#f5f5f7;color:#86868b;padding:3px 10px;border-radius:980px;font-size:.73rem;font-weight:500;margin-bottom:8px}
.blog-card h3{font-size:1.05rem;font-weight:600;margin-bottom:6px;line-height:1.3}
.blog-card p{font-size:.87rem;color:#86868b;line-height:1.5}
.blog-card .rm{display:inline-block;margin-top:10px;font-size:.87rem;font-weight:600}

/* Article */
.article-body{max-width:720px;margin:0 auto;padding:40px 20px}
.article-body h1{font-size:2rem;font-weight:700;line-height:1.2;margin-bottom:8px}
.article-body .meta{color:#86868b;font-size:.87rem;margin-bottom:24px}
.article-body img{width:100%;border-radius:12px;margin:24px 0}
.article-body h2{font-size:1.4rem;font-weight:700;margin:32px 0 12px;padding-top:16px;border-top:1px solid #d2d2d7}
.article-body p{margin-bottom:16px;line-height:1.8}
.article-body ul,.article-body ol{margin:16px 0 16px 24px}
.article-body li{margin-bottom:6px;line-height:1.7}
.article-body blockquote{border-left:4px solid #0071e3;padding:16px 20px;background:#f5f5f7;border-radius:0 10px 10px 0;margin:20px 0;color:#86868b;font-style:italic}

/* Sidebar */
.with-sidebar{display:grid;grid-template-columns:1fr 280px;gap:40px;padding:40px 0}
@media(max-width:768px){.with-sidebar{grid-template-columns:1fr}}
.sidebar{background:#f5f5f7;border-radius:14px;padding:20px;align-self:start;position:sticky;top:72px}
.sidebar h3{font-size:.87rem;font-weight:600;margin-bottom:10px;color:#86868b;text-transform:uppercase;letter-spacing:.04em}
.sidebar a{display:block;font-size:.87rem;color:#1d1d1f;padding:6px 0;border-bottom:1px solid #d2d2d7}
.sidebar a:last-child{border:none}
.sidebar a:hover{color:#0071e3}

/* Static pages */
.sp{max-width:720px;margin:0 auto;padding:40px 20px}
.sp h1{font-size:2rem;font-weight:700;margin-bottom:20px}
.sp h2{font-size:1.3rem;font-weight:600;margin:28px 0 10px}
.sp p,.sp li{margin-bottom:10px;line-height:1.7}

/* Breadcrumbs */
.bc{padding:14px 0;font-size:.82rem;color:#86868b}
.bc a{color:#86868b}.bc a:hover{color:#0071e3}

/* Footer */
.site-footer{background:#1d1d1f;color:rgba(255,255,255,.6);padding:48px 0 24px;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;margin-bottom:32px}
.footer-grid h4{color:#fff;font-size:.87rem;font-weight:600;margin-bottom:12px}
.footer-grid a{display:block;color:rgba(255,255,255,.5);font-size:.82rem;padding:3px 0}
.footer-grid a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;font-size:.78rem;text-align:center}
@media(max-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}.hero h1{font-size:2.2rem}.stats{gap:24px;flex-wrap:wrap}}