:root{--klf-accent:#0ea5e9;--klf-bg:#0f172a;--klf-surface:#1e293b;--klf-border:#334155;--klf-text:#e2e8f0;--klf-text-muted:#94a3b8;--klf-c-size:58px;--klf-c-bottom:90px;--klf-c-side:18px}

.klf-buttons *,.klf-overlay *,.klf-contact *{box-sizing:border-box}

/* ---------- Nút đăng nhập / đăng ký ---------- */
.klf-buttons{display:inline-flex;gap:10px;align-items:center;margin:0}
.klf-buttons.klf-al-center{display:flex;justify-content:center}
.klf-buttons.klf-al-right{display:flex;justify-content:flex-end}
.klf-buttons.klf-full{display:flex;width:100%}
.klf-buttons.klf-full .klf-btn{flex:1}

.klf-btn{font:500 14px/1.4 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;padding:10px 20px;border-radius:8px;cursor:pointer;border:none;transition:background .2s,border-color .2s,transform .2s;text-decoration:none;display:inline-block;white-space:nowrap}
.klf-btn:focus-visible{outline:2px solid var(--klf-accent);outline-offset:2px}
.klf-btn-ghost{background:transparent;color:var(--klf-text);border:1.5px solid var(--klf-border)}
.klf-btn-ghost:hover{background:var(--klf-surface);border-color:var(--klf-accent);color:var(--klf-text)}
.klf-btn-solid{background:var(--klf-accent);color:#000;font-weight:600}
.klf-btn-solid:hover{filter:brightness(1.08);transform:translateY(-1px)}

/* ---------- Thanh liên hệ ---------- */
.klf-contact{display:flex;gap:12px}
.klf-contact-fixed{position:fixed;bottom:var(--klf-c-bottom);z-index:99998;flex-direction:column}
.klf-contact-fixed.klf-side-right{right:var(--klf-c-side)}
.klf-contact-fixed.klf-side-left{left:var(--klf-c-side)}
.klf-contact-inline{position:static;flex-direction:row;justify-content:center;flex-wrap:wrap;gap:10px}

.klf-c-item{position:relative;display:block;width:var(--klf-c-size);height:var(--klf-c-size);line-height:0;box-shadow:0 6px 18px rgba(0,0,0,.28);transition:transform .18s ease;background:transparent}
.klf-contact-inline .klf-c-item{width:44px;height:44px;box-shadow:none}
.klf-c-item img{width:100%;height:100%;object-fit:cover;display:block;border-radius:inherit}
.klf-c-item:hover{transform:scale(1.07)}
.klf-c-item:focus-visible{outline:2px solid var(--klf-accent);outline-offset:3px}

.klf-shape-circle .klf-c-item{border-radius:50%}
.klf-shape-round .klf-c-item{border-radius:14px}
.klf-shape-square .klf-c-item{border-radius:0}

.klf-c-tip{position:absolute;top:50%;transform:translateY(-50%);white-space:nowrap;background:var(--klf-bg);color:var(--klf-text);border:1px solid var(--klf-border);font:500 13px/1 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;padding:7px 10px;border-radius:6px;opacity:0;pointer-events:none;transition:opacity .18s}
.klf-side-right .klf-c-tip{right:calc(100% + 10px)}
.klf-side-left .klf-c-tip{left:calc(100% + 10px)}
.klf-contact-inline .klf-c-tip{display:none}
.klf-c-item:hover .klf-c-tip,.klf-c-item:focus-visible .klf-c-tip{opacity:1}

.klf-pulse .klf-c-item::after{content:'';position:absolute;inset:0;border-radius:inherit;border:2px solid var(--klf-accent);animation:klf-ring 2.2s ease-out infinite;pointer-events:none}
@keyframes klf-ring{0%{transform:scale(1);opacity:.7}70%{transform:scale(1.45);opacity:0}100%{transform:scale(1.45);opacity:0}}

/* ---------- Popup ---------- */
.klf-overlay{position:fixed;inset:0;z-index:99999;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:16px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}
.klf-overlay[hidden]{display:none}

.klf-modal{position:relative;width:100%;max-width:440px;max-height:85vh;overflow-y:auto;background:var(--klf-bg);color:var(--klf-text);border:1px solid var(--klf-border);border-radius:16px;padding:32px 28px;box-shadow:0 20px 25px rgba(0,0,0,.15),0 8px 10px rgba(0,0,0,.1);animation:klf-in .22s ease}
@keyframes klf-in{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

.klf-close{position:absolute;top:12px;right:12px;width:36px;height:36px;background:transparent;border:0;color:var(--klf-text-muted);font-size:24px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:6px;transition:background .2s,color .2s;padding:0}
.klf-close:hover{background:var(--klf-surface);color:var(--klf-text)}

.klf-tabs{display:flex;gap:8px;margin-bottom:24px;border-bottom:1px solid var(--klf-border)}
.klf-tab{flex:1;background:none;border:none;border-bottom:2px solid transparent;color:var(--klf-text-muted);font:500 14px/1 inherit;padding:12px 4px;cursor:pointer;margin-bottom:-1px;transition:color .2s,border-color .2s}
.klf-tab:hover{color:var(--klf-text)}
.klf-tab.is-active{color:var(--klf-accent);border-bottom-color:var(--klf-accent)}

.klf-form[hidden]{display:none}
.klf-intro{margin:0 0 20px;font-size:14px;color:var(--klf-text-muted);line-height:1.6}

.klf-field{margin-bottom:16px}
.klf-field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--klf-text)}
.klf-field label i{color:var(--klf-accent);font-style:normal;margin-left:2px}
.klf-field input,.klf-field select,.klf-field textarea{width:100%;background:var(--klf-surface);border:1px solid var(--klf-border);border-radius:8px;color:var(--klf-text);font:14px/1.5 inherit;padding:11px 13px;transition:border-color .2s,box-shadow .2s,background .2s}
.klf-field input::placeholder,.klf-field textarea::placeholder{color:var(--klf-text-muted)}
.klf-field input:focus,.klf-field select:focus,.klf-field textarea:focus{outline:none;border-color:var(--klf-accent);background:var(--klf-bg);box-shadow:0 0 0 3px rgba(14,165,233,.12)}

.klf-pass{position:relative;display:block}
.klf-pass input{padding-right:62px}
.klf-eye{position:absolute;top:50%;right:6px;transform:translateY(-50%);background:transparent;border:0;color:var(--klf-text-muted);font:600 12px/1 inherit;padding:8px;cursor:pointer;border-radius:6px}
.klf-eye:hover{color:var(--klf-accent)}

.klf-hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

.klf-error{margin:0 0 16px;padding:12px 14px;border-radius:8px;background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);color:#fca5a5;font-size:13px;line-height:1.5}
.klf-error[hidden]{display:none}

.klf-submit{width:100%;padding:12px;font-size:15px;font-weight:600;margin-top:8px;background:var(--klf-accent);color:#000;border:none;border-radius:8px;cursor:pointer;transition:filter .2s,transform .2s}
.klf-submit:hover:not([disabled]){filter:brightness(1.08);transform:translateY(-1px)}
.klf-submit[disabled]{opacity:.55;cursor:wait;transform:none}

.klf-modal-contact{margin-top:22px;padding-top:18px;border-top:1px solid var(--klf-border)}
.klf-or{margin:0 0 12px;text-align:center;font-size:13px;color:var(--klf-text-muted)}

.klf-done{text-align:center;padding:8px 0}
.klf-done b{display:block;font-size:16px;margin-bottom:6px}
.klf-done span{font-size:14px;color:var(--klf-text-muted)}

.klf-modal::-webkit-scrollbar{width:6px}
.klf-modal::-webkit-scrollbar-track{background:transparent}
.klf-modal::-webkit-scrollbar-thumb{background:var(--klf-border);border-radius:3px}

@media (max-width:480px){
	.klf-overlay{padding:12px}
	.klf-modal{padding:24px 20px;border-radius:12px}
	.klf-close{width:32px;height:32px;font-size:20px}
	.klf-btn{padding:9px 16px;font-size:13px}
	.klf-tabs{gap:4px;margin-bottom:20px}
	.klf-field{margin-bottom:14px}
	.klf-field input,.klf-field select,.klf-field textarea{font-size:16px;padding:10px 12px}
	.klf-contact-fixed{--klf-c-size:50px;gap:10px}
	.klf-contact-fixed.klf-hide-mobile{display:none}
	.klf-c-tip{display:none}
}

@media (prefers-reduced-motion:reduce){
	.klf-pulse .klf-c-item::after{animation:none;opacity:0}
	.klf-modal{animation:none}
	.klf-c-item:hover,.klf-btn:hover,.klf-submit:hover{transform:none}
}