/* bootstrap-lite.css (offline)
   Minimal subset inspired by Bootstrap5 for md2ex UI.
*/
*,*::before,*::after{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:#111;background:#f5f6f7}
.container-fluid{width:100%;padding:0 16px;margin:0 auto}
.row{display:flex;flex-wrap:wrap;margin:0 -8px}
.col-lg-6{flex:0 0 50%;max-width:50%;padding:0 8px}
@media (max-width: 992px){.col-lg-6{flex:0 0 100%;max-width:100%}}

/* navbar */
.navbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px}
.navbar .brand{display:flex;align-items:center;gap:10px}
.navbar .brand .logo{font-weight:900;letter-spacing:.5px}
.navbar .nav-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border-radius:10px;border:1px solid rgba(0,0,0,.12);background:#fff;cursor:pointer;font-size:13px;line-height:1}
.btn:hover{filter:brightness(.98)}
.btn:active{transform:translateY(1px)}
.btn-danger{background:#ff4d4f;border-color:#ff4d4f;color:#fff}
.btn-outline{background:transparent;border-color:rgba(255,255,255,.25);color:#e5e7eb}

/* inputs */
.form-control,.form-select{width:100%;padding:8px 10px;border-radius:10px;border:1px solid rgba(0,0,0,.12);background:#fff;font-size:13px}
.form-select{appearance:auto}

/* card */
.card{background:#fff;border-radius:14px;border:1px solid rgba(0,0,0,.06);box-shadow:0 10px 30px rgba(16,24,40,.06)}
.card-header{padding:12px 14px;border-bottom:1px solid rgba(0,0,0,.06);display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.card-body{padding:14px}

/* utilities */
.gap-2{gap:8px}
.d-flex{display:flex}
.align-center{align-items:center}
.justify-between{justify-content:space-between}
.text-muted{color:#6b7280}
.small{font-size:12px}

/* dropdown */
.dropdown{position:relative}
.dropdown-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:140px;background:#fff;border:1px solid rgba(0,0,0,.08);border-radius:12px;box-shadow:0 18px 40px rgba(0,0,0,.12);padding:6px;display:none;z-index:10}
.dropdown-menu a{display:block;padding:8px 10px;border-radius:10px;color:#111;text-decoration:none;font-size:13px}
.dropdown-menu a:hover{background:#f3f4f6}
.dropdown.open .dropdown-menu{display:block}

/* layout heights */
#previewWrap{height:70vh;overflow:auto;background:#fff;border-radius:14px}
#mdInput{min-height:60vh;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}
/* compatibility for some bootstrap class names used in template */
.btn-sm{padding:6px 10px;border-radius:10px}
.btn-default{background:#fff}
.input-sm{font-size:13px}
.w-auto{width:auto}
.me-2{margin-right:8px}
.ms-2{margin-left:8px}
.mt-2{margin-top:8px}
.mt-3{margin-top:12px}
.mb-2{margin-bottom:8px}
.p-0{padding:0}
.p-2{padding:8px}
.p-3{padding:12px}
.p-4{padding:16px}
.rounded{border-radius:14px}