:root{--red:#ff3b3b;--blue:#007bff;--dark-bg:#121212;--light-bg:#fff;--text-light:#f5f5f5;--text-dark:#111;--card-bg:#1e1e1e;--border:#2c2c2c}
html[data-theme='light']{--dark-bg:#f5f7fb;--text-light:#111;--card-bg:#fff;--border:#e5e7eb}
*{box-sizing:border-box;transition:background-color .25s,color .25s,border-color .25s}
body{margin:0;font-family:Poppins,Arial,sans-serif;background:var(--dark-bg);color:var(--text-light);display:flex;flex-direction:column;min-height:100vh}
.header{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--card-bg);border-bottom:2px solid var(--red)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo{height:40px;border-radius:8px}
.brand-name{font-weight:700;color:var(--text-light);font-size:1.1rem}
.header-right{display:flex;align-items:center;gap:10px}
.btn{background:var(--red);color:#fff;border:none;padding:8px 14px;border-radius:8px;font-weight:700;text-decoration:none;display:inline-block;cursor:pointer}
.btn:hover{filter:brightness(.95)}
.btn-outline{background:transparent;color:var(--text-light);border:2px solid var(--red)}
.btn-outline:hover{background:var(--red);color:#fff}
main{width:90%;max-width:960px;margin:28px auto;background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:20px;flex:1}
h1,h3{color:var(--blue);margin:0 0 14px;text-align:center}
h2{color:var(--red);margin:0 0 14px;text-align:center}
input,textarea,select{width:100%;padding:10px 12px;background:#1b1b1b;color:var(--text-light);border:1px solid var(--border);border-radius:8px;margin:6px 0 12px}
html[data-theme='light'] input,html[data-theme='light'] textarea,html[data-theme='light'] select{background:#fff;color:#111;border-color:#d1d5db}
.post-form{margin:8px 0 20px}.post-form textarea{height:120px;resize:none}.posts{display:flex;flex-direction:column;gap:14px}
.post{background:#1c1c1c;border:1px solid var(--border);border-radius:12px;padding:14px}html[data-theme='light'] .post{background:#fff}
.post .author{color:var(--blue);font-weight:700}.post .date{color:#a3a3a3;font-size:.85rem;display:block;text-align:right}
.post-actions{display:flex;gap:8px;margin-top:10px}.btn-like,.btn-comment{background:transparent;border:1px solid var(--border);color:var(--text-light);padding:6px 10px;border-radius:8px;cursor:pointer}
.btn-like:hover{color:var(--red);border-color:var(--red)}.btn-comment:hover{color:var(--blue);border-color:var(--blue)}
footer{text-align:center;padding:14px;border-top:2px solid var(--red);background:var(--card-bg);color:var(--text-light)}