/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Open Sans',sans-serif;font-size:15px;line-height:1.6;color:#333;background:#f5f5f5;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit;transition:color .3s}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-family:'Montserrat','Open Sans',sans-serif;font-weight:700;line-height:1.3}
.container{max-width:1200px;margin:0 auto;padding:0 16px}

:root{
  --primary:#0277BD;--secondary:#4FC3F7;--bg:#E1F5FE;
  --text:#333;--card-bg:#fff;--body-bg:#f5f5f5;
  --header-bg:#fff;--border:#e0e0e0;--muted:#999;
  --primary-light:#0277BD22;--radius:24px;--card-radius:16px;
}

/* === Header === */
.site-header{background:#fff;position:sticky;top:0;z-index:100;border-bottom:1px solid #e0e0e0}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 0;gap:16px}
.site-logo .logo-img{height:40px;width:auto;border-radius:8px}
.header-actions{display:flex;gap:8px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:8px 20px;border-radius:24px;font-weight:600;font-size:14px;transition:all .3s;cursor:pointer;border:none;font-family:'Montserrat','Open Sans',sans-serif}
.btn-login{background:transparent;color:#0277BD;border:1.5px solid #0277BD}
.btn-login:hover{background:#0277BD;color:#fff}
.btn-register{background:#0277BD;color:#fff}
.btn-register:hover{opacity:.85;color:#fff}
.btn-download{background:#4FC3F7;color:#fff;font-size:16px;padding:12px 32px}
.btn-download:hover{opacity:.9;transform:translateY(-1px)}

/* === Navigation === */
.main-nav{flex:1;display:flex;justify-content:center}
.nav-menu{display:flex;gap:4px;align-items:center;flex-wrap:wrap}
.nav-menu li a{padding:8px 16px;border-radius:20px;font-weight:500;font-size:14px;transition:all .3s;color:inherit}
.nav-menu li a:hover,.nav-menu li.current-menu-item a{background:var(--primary);color:#fff}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle-icon{display:block;width:24px;height:2px;background:currentColor;position:relative}
.nav-toggle-icon::before,.nav-toggle-icon::after{content:'';position:absolute;left:0;width:100%;height:2px;background:currentColor}
.nav-toggle-icon::before{top:-7px}.nav-toggle-icon::after{top:7px}
@media(max-width:768px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--header-bg);padding:16px;border-bottom:1px solid var(--border)}
  .main-nav.active{display:block}
  .nav-menu{flex-direction:column;gap:0}
  .nav-menu li a{display:block;padding:12px 16px;border-radius:0}
  .header-actions .btn-login{display:none}
}

/* === Feed Hero === */
.feed-hero{background:linear-gradient(135deg,#0277BD,#4FC3F7);color:#fff;padding:40px 0 30px;text-align:center}
.feed-hero h1{font-size:28px;margin-bottom:8px}
.feed-hero p{opacity:.85;font-size:15px}


/* === Feed Layout === */
.feed-section{padding:20px 0}
.section-title{font-size:20px;margin-bottom:16px;color:#0277BD}
.waterfall-grid{columns:3;column-gap:16px}
.waterfall-grid .feed-card{break-inside:avoid;margin-bottom:16px}
@media(max-width:991px){.waterfall-grid{columns:2}}
@media(max-width:575px){.waterfall-grid{columns:1}}

/* === Feed Card === */
.feed-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,0.12);transition:all .3s;}
.feed-card:hover{box-shadow:0 12px 32px rgba(0,0,0,0.2);transform:translateY(-2px)}
.card-image{position:relative;overflow:hidden}
.card-image img{width:100%;display:block;transition:transform .5s}
.feed-card:hover .card-image img{transform:scale(1.05)}

.card-body{padding:20px}
.card-avatar{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.card-avatar img{width:36px;height:36px;border-radius:50%;object-fit:cover}
.card-avatar .user-name{font-weight:600;font-size:14px}
.card-avatar .post-time{font-size:12px;color:#999}
.card-title{font-size:16px;font-weight:600;margin-bottom:6px;line-height:1.4}
.card-title a:hover{color:#0277BD}
.card-excerpt{font-size:14px;color:#999;line-height:1.5;margin-bottom:12px}
.card-actions{display:flex;gap:16px;align-items:center;padding-top:10px;border-top:1px solid #e0e0e0}
.card-action{display:flex;align-items:center;gap:4px;font-size:13px;color:#999;cursor:pointer;transition:color .3s;background:none;border:none;font-family:'Open Sans',sans-serif}
.card-action:hover{color:#0277BD}
.card-action svg{width:18px;height:18px}
.card-action.liked{color:#0277BD}

/* === Horizontal Scroll === */
.hscroll-section{padding:20px 0}
.hscroll-wrapper{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;padding-bottom:8px;scrollbar-width:none}
.hscroll-wrapper::-webkit-scrollbar{display:none}
.hscroll-item{min-width:260px;max-width:260px;scroll-snap-align:start;flex-shrink:0}
.hscroll-item .feed-card{height:100%}

/* === Card Grid === */
.cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:991px){.cards-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:575px){.cards-grid{grid-template-columns:1fr}}

/* === Community Section === */
.community-section{padding:20px 0}
.community-card{background:#fff;border-radius:16px;padding:20px;box-shadow:0 4px 16px rgba(0,0,0,0.12);}
.comment-item{display:flex;gap:10px;padding:10px 0;border-bottom:1px solid #e0e0e0}
.comment-item:last-child{border-bottom:none}
.comment-avatar{width:32px;height:32px;border-radius:50%;object-fit:cover;flex-shrink:0}
.comment-body{flex:1}
.comment-user{font-weight:600;font-size:13px}
.comment-text{font-size:14px;color:#999;margin-top:2px}
.comment-meta{font-size:12px;color:#999;margin-top:4px;display:flex;gap:12px}

/* === Load More === */
.load-more-wrap{text-align:center;padding:24px 0}
.btn-load-more{background:#0277BD;color:#fff;padding:12px 40px;border-radius:24px;font-size:15px;font-weight:600;border:none;cursor:pointer;transition:all .3s;font-family:'Montserrat','Open Sans',sans-serif}
.btn-load-more:hover{opacity:.9;transform:translateY(-1px)}
.load-more-wrap.loading .btn-load-more{opacity:.5;pointer-events:none}
.load-spinner{display:none;width:24px;height:24px;border:3px solid #0277BD33;border-top-color:#0277BD;border-radius:50%;animation:spin .8s linear infinite;margin:0 auto}
.load-more-wrap.loading .load-spinner{display:block}
@keyframes spin{to{transform:rotate(360deg)}}

/* === Interaction === */
.scroll-reveal{opacity:0;transform:translateY(24px);transition:opacity .6s,transform .6s}
.scroll-reveal.revealed{opacity:1;transform:translateY(0)}

/* === Footer === */
.site-footer{background:#fff;border-top:1px solid #e0e0e0;padding:32px 0 20px;margin-top:40px}
.footer-widgets{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:24px}
@media(max-width:768px){.footer-widgets{grid-template-columns:1fr}}
.footer-widget .widget-title{font-size:16px;margin-bottom:12px;color:#0277BD}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid #e0e0e0}
.disclaimer-text{font-size:13px;color:#999;margin-top:12px;line-height:1.6}

/* === Single Post === */
.single-post{max-width:800px;margin:0 auto;padding:32px 16px}
.single-post .post-title{font-size:28px;margin-bottom:12px}
.single-post .post-meta{display:flex;gap:16px;font-size:14px;color:#999;margin-bottom:20px;flex-wrap:wrap}
.single-post .post-thumb{margin-bottom:24px;border-radius:16px;overflow:hidden}
.single-post .post-thumb img{width:100%}
.single-post .post-content{font-size:16px;line-height:1.8}
.single-post .post-content p{margin-bottom:16px}
.related-posts{padding:40px 0}
.page-content{max-width:800px;margin:0 auto;padding:32px 16px}
.page-title{font-size:28px;margin-bottom:20px}

/* === Responsive === */
@media(max-width:991px){.container{padding:0 12px}.feed-hero h1{font-size:22px}}
@media(max-width:575px){.feed-hero{padding:24px 0 20px}.feed-hero h1{font-size:20px}.section-title{font-size:18px}.card-body{padding:12px}.single-post .post-title{font-size:22px}.hscroll-item{min-width:220px;max-width:220px}}