/* =====================================================
   忠台AI — 共用 NAV 樣式
   來源：privacy.html 內嵌 NAV 區（線上已驗證），抽出供 blog 頁載入
   ===================================================== */
/* NAV */
body > header{position:sticky;top:0;z-index:200;height:80px;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:0 1.5rem;background-color:#ffffff;box-shadow:0 2px 8px rgba(0,0,0,0.08)}
body > header::before{content:'';position:absolute;inset:0;background:none;pointer-events:none;z-index:0}
body > header::after{content:'';position:absolute;bottom:0;left:0;right:0;height:1px;background:#e5e9f0}
body > header nav{z-index:1;margin:0;display:flex;align-items:center;gap:1.5rem;flex:1;justify-content:flex-end}
.nav-links{list-style:none;display:flex;gap:2rem;align-items:center}
.nav-links a{color:#1e293b;text-decoration:none;font-size:1.125rem;font-weight:500;padding:.2em 0;position:relative;transition:color .3s cubic-bezier(0.2,0.8,0.2,1);letter-spacing:.02em;white-space:nowrap}
.nav-links a::after{content:'';position:absolute;bottom:-2px;left:50%;right:50%;height:1.5px;background:linear-gradient(90deg,#00e5ff,#00b4d8);transition:left .25s cubic-bezier(0.2,0.8,0.2,1),right .25s cubic-bezier(0.2,0.8,0.2,1)}
.nav-links a:hover,.nav-links a:focus-visible{color:#0070c9}.nav-links a:hover::after,.nav-links a:focus-visible::after{left:0;right:0}
.nav-links a:focus-visible{outline:2px solid rgba(0,229,255,.4);outline-offset:4px;border-radius:2px}
.nav-links a.nav-active{color:#0070c9;text-shadow:none}
.nav-links a.nav-active::after{left:0;right:0}
.nav-cta{display:flex;align-items:center;gap:.6rem;z-index:1;flex-shrink:0}
.nav-cta .btn-register{padding:.5rem 1.25rem;border-radius:6px;font-size:1rem;font-weight:600;background:linear-gradient(135deg,#0070c9 0%,#00b4d8 100%);color:#fff;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:all .3s cubic-bezier(0.2,0.8,0.2,1)}
.nav-cta .btn-register:hover{filter:brightness(1.13);transform:translateY(-1px)}
.nav-cta .btn-register:active{transform:translateY(1px);filter:brightness(.95)}
.nav-cta .btn-login{padding:.5rem 1.25rem;border-radius:6px;font-size:1rem;font-weight:500;background:transparent;color:#1e293b;text-decoration:none;border:1px solid #0070c9;cursor:pointer;transition:all .3s cubic-bezier(0.2,0.8,0.2,1)}
.nav-cta .btn-login:hover{border-color:#0070c9;color:#0070c9;transform:translateY(-1px)}
.hamburger{display:none;align-items:center;justify-content:center;cursor:pointer;z-index:10;padding:6px;border-radius:6px;background:none;border:none;color:#1e293b;flex-shrink:0;line-height:1}.hamburger:hover{background:rgba(0,0,0,.05)}
.mobile-menu{display:none;position:fixed;top:80px;left:0;right:0;background:rgba(4,6,8,.97);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid rgba(0,160,255,.12);padding:1.25rem 0 1.5rem;z-index:99;max-height:calc(100vh - 80px);overflow-y:auto;flex-direction:column;align-items:center;gap:.25rem}
.mobile-menu.open{display:flex}
.mobile-menu a{color:#8899bb;text-decoration:none;font-size:1rem;font-weight:500;padding:.65rem 2rem;width:100%;text-align:center;transition:color .2s cubic-bezier(0.2,0.8,0.2,1),background .2s}
.mobile-menu a:hover{color:#fff;background:rgba(0,160,255,.06)}
.mobile-menu hr,.mobile-menu .mobile-divider{border:none;border-top:1px solid rgba(136,153,187,.12);margin:.5rem 1.5rem}
.mobile-menu .m-cta{display:flex;gap:.75rem;margin-top:.5rem;padding:.5rem 2rem;width:100%}
.mobile-menu .m-lang{padding:.5rem 2rem;display:flex;justify-content:center}
.mobile-menu .btn-register,.mobile-menu .btn-login{display:block;text-align:center;margin:.4rem 2rem;padding:.65rem 1rem;border-radius:6px;font-weight:600;text-decoration:none;box-sizing:border-box;width:auto}
.mobile-menu .btn-register{background:linear-gradient(135deg,#0070c9 0%,#00b4d8 100%);color:#fff;border:1px solid transparent}
.mobile-menu .btn-login{background:transparent;color:#fff;border:1px solid #0070c9}
@media(max-width:1280px){.nav-links{display:none}.nav-cta .btn-login{display:none}.hamburger{display:flex}}
@media(max-width:768px){.nav-cta{display:none}}
.nav-home-logo{display:flex;align-items:center;z-index:2;text-decoration:none;flex-shrink:0}
.nav-home-logo img{height:52px;width:auto;display:block;transition:opacity .25s cubic-bezier(0.2,0.8,0.2,1),transform .25s cubic-bezier(0.2,0.8,0.2,1)}
.nav-home-logo:hover img{opacity:.82;transform:scale(1.06)}
/* ===== END STANDARD NAV ===== */