/* =======================================
THÔNG TIN AI
Version 3.0
======================================= */

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&display=swap');

:root{
    --primary:#2563eb;
    --primary-dark:#1d4ed8;
    --background:#f4f7fb;
    --white:#ffffff;
    --text:#1e293b;
    --gray:#64748b;
    --border:#e5e7eb;
    --shadow:0 15px 40px rgba(0,0,0,.08);
    --radius:18px;
}

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

html{
    scroll-behavior:smooth;
}

body{
    font-family:'Poppins',sans-serif;
    background:var(--background);
    color:var(--text);
    transition:background .3s, color .3s;
}

img{
    max-width:100%;
    display:block;
}

a{
    text-decoration:none;
    color:inherit;
}

button{
    cursor:pointer;
}

/* =======================================
HEADER
======================================= */
.header{
    height:80px;
    background:white;
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:0 60px;
    position:sticky;
    top:0;
    z-index:999;
    box-shadow:0 5px 15px rgba(0,0,0,.08);
}

.logo{
    font-size:30px;
    font-weight:700;
    color:var(--primary);
}

nav{
    display:flex;
    gap:35px;
}

nav a{
    font-weight:500;
    transition:.3s;
}

nav a:hover{
    color:var(--primary);
}

.header-right{
    display:flex;
    align-items:center;
    gap:12px;
}

.header-right button{
    background:var(--primary);
    color:white;
    border:none;
    padding:10px 18px;
    border-radius:12px;
    font-size:18px;
}

/* Chế độ thu gọn: hiển thị được nhiều nội dung hơn, vẫn giữ thao tác dễ chạm. */
body.compact .header{
    height:64px;
    padding:0 42px;
}

body.compact .logo{font-size:24px}
body.compact .hero{min-height:390px;padding:55px}
body.compact .hero h1{font-size:48px;margin-bottom:12px}
body.compact .hero p{font-size:17px}
body.compact .search-box{margin-top:28px}
body.compact .search-box input{height:52px}
body.compact .main{margin:42px auto;gap:28px}
body.compact .sidebar{padding:20px;top:82px}
body.compact .sidebar li{padding:11px;margin-bottom:6px}
body.compact .tool-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
body.compact .tool-image{height:140px}
body.compact .tool-content{padding:18px}
body.compact .tool-content h3{font-size:20px;margin-bottom:7px}
body.compact .tool-content p{font-size:14px;line-height:1.6;min-height:56px;margin-bottom:14px}
body.compact .btn{padding:11px}
body.compact .footer-stats{padding-bottom:42px;gap:14px}
body.compact .stat-box{padding:20px 14px}

#mobileMenuBtn{
    display:none;
    background:none;
    color:var(--text);
    border:none;
    font-size:26px;
    padding:6px 10px;
    border-radius:10px;
}

body.dark #mobileMenuBtn{
    color:#e2e8f0;
}

.lang-select select{
    background:white;
    color:#1e293b;
    border:1.5px solid #e2e8f0;
    padding:8px 12px;
    border-radius:12px;
    font-size:14px;
    font-weight:500;
    font-family:inherit;
    cursor:pointer;
    outline:none;
    transition:.3s;
}

.lang-select select:hover{
    border-color:var(--primary);
}

body.dark .lang-select select{
    background:#1e293b;
    color:#e2e8f0;
    border-color:#334155;
}

/* =======================================
HERO
======================================= */
.hero{
    background:
        radial-gradient(circle at 8px 8px, rgba(255,255,255,.16) 1.6px, transparent 1.6px) 0 0/40px 40px,
        radial-gradient(circle at 1200px 60px, rgba(255,255,255,.12) 220px, transparent 60%),
        linear-gradient(135deg,#2563eb,#1e40af);
    min-height:500px;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    color:white;
    padding:80px;
    position:relative;
    overflow:hidden;
}

.hero-text{
    max-width:850px;
    position:relative;
    z-index:2;
}

.hero-robot{
    position:absolute;
    right:40px;
    bottom:-10px;
    width:200px;
    height:auto;
    object-fit:contain;
    opacity:.95;
    filter:drop-shadow(0 15px 25px rgba(0,0,0,.3));
    animation:robotFloat 3.5s ease-in-out infinite;
}

@keyframes robotFloat{
    0%,100%{ transform:translateY(0); }
    50%{ transform:translateY(-14px); }
}

.hero h1{
    font-size:64px;
    margin-bottom:20px;
}

.hero p{
    font-size:20px;
    opacity:.95;
}

.search-box{
    margin-top:40px;
    display:flex;
    justify-content:center;
    position:relative;
}

.search-box input{
    width:600px;
    height:60px;
    border:none;
    outline:none;
    padding:0 20px;
    border-radius:15px 0 0 15px;
    font-size:17px;
}

.search-box button{
    width:150px;
    border:none;
    background:#0f172a;
    color:white;
    border-radius:0 15px 15px 0;
    font-size:17px;
}

.search-box .clear-search{
    position:absolute;
    right:155px;
    top:50%;
    width:32px;
    height:32px;
    padding:0;
    transform:translateY(-50%);
    border-radius:50%;
    background:#e2e8f0;
    color:#475569;
    font-size:24px;
    line-height:1;
}

.search-box .clear-search:hover{background:#cbd5e1}

/* =======================================
LAYOUT
======================================= */
.main{
    max-width:1160px;
    margin:60px auto;
    display:grid;
    grid-template-columns:260px 1fr;
    gap:40px;
    padding:0 20px;
}

.quick-utilities{display:none}

.sidebar{
    background:white;
    border-radius:20px;
    padding:25px;
    box-shadow:var(--shadow);
    height:fit-content;
    position:sticky;
    top:100px;
    max-height:calc(100vh - 120px);
    overflow-y:auto;
}

.sidebar h3{
    margin-bottom:25px;
    font-size:22px;
}

.sidebar ul{
    list-style:none;
}

.sidebar li{
    padding:15px;
    border-radius:12px;
    margin-bottom:10px;
    cursor:pointer;
    transition:.3s;
}

.sidebar li:hover{
    background:#2563eb;
    color:white;
}

.sidebar li.active{
    background:#2563eb;
    color:white;
}

.utility-title{
    margin-top:30px;
    margin-bottom:20px;
    font-size:19px;
    padding-top:20px;
    border-top:1px solid var(--border);
}

body.dark .utility-title{
    border-top-color:#334155;
}

.utility-list{
    list-style:none;
}

.utility-list li{
    padding:13px 15px;
    border-radius:12px;
    margin-bottom:8px;
    cursor:pointer;
    font-size:15px;
    transition:.3s;
}

@media(min-width:901px){
    .utility-list{
        display:grid;
        grid-template-columns:1fr 1fr;
        gap:6px;
    }

    .utility-list li{
        margin-bottom:0;
        padding:10px 8px;
        font-size:12px;
    }
}

.utility-list li:hover{
    background:#eff6ff;
    color:var(--primary);
}

.utility-list li.active{
    background:#2563eb;
    color:white;
}

body.dark .utility-list li:hover{
    background:#334155;
    color:#93c5fd;
}

.content{
    width:100%;
}

.mobile-toggle-btn{
    display:none;
    width:100%;
    align-items:center;
    justify-content:center;
    gap:10px;
    background:white;
    border:none;
    padding:16px;
    border-radius:16px;
    box-shadow:var(--shadow);
    font-size:16px;
    font-weight:600;
    color:var(--text);
    margin-bottom:20px;
    cursor:pointer;
}

body.dark .mobile-toggle-btn{
    background:#1e293b;
    color:#e2e8f0;
}

.section-title{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:30px;
}

.section-title h2{
    font-size:34px;
    font-weight:700;
}

.tool-count{
    color:var(--gray);
    font-weight:600;
    font-size:15px;
}

.tool-controls{
    display:flex;
    align-items:center;
    gap:10px;
}

.sort-label{
    color:var(--gray);
    font-size:14px;
    font-weight:600;
}

.sort-select{
    border:1px solid var(--border);
    border-radius:10px;
    background:var(--white);
    color:var(--text);
    padding:8px 10px;
    font:inherit;
    font-size:14px;
    cursor:pointer;
}

body.dark .sort-select{
    background:#1e293b;
    color:#e2e8f0;
    border-color:#334155;
}

.hidden{
    display:none !important;
}

#knowledge-section{
    margin-bottom:60px;
}

nav a.active-link{
    color:var(--primary);
}

/* =======================================
KIẾN THỨC AI
======================================= */
.knowledge-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
    gap:20px;
}

.knowledge-card{
    background:white;
    border-radius:20px;
    padding:25px;
    box-shadow:var(--shadow);
    transition:.3s;
}

.knowledge-card:hover{
    transform:translateY(-6px);
    box-shadow:0 20px 45px rgba(0,0,0,.12);
}

.knowledge-icon{
    font-size:34px;
    width:60px;
    height:60px;
    display:flex;
    align-items:center;
    justify-content:center;
    background:linear-gradient(135deg,#eff6ff,#dbeafe);
    border-radius:16px;
    margin-bottom:16px;
}

.knowledge-card h3{
    font-size:20px;
    margin-bottom:12px;
    color:var(--primary);
}

.knowledge-card p{
    color:var(--gray);
    line-height:1.7;
}

.knowledge-card ul{
    padding-left:20px;
    color:var(--gray);
    line-height:1.9;
}

/* =======================================
AI THEO NGHỀ
======================================= */
.profession-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
    gap:20px;
}

.profession-card{
    background:white;
    border-radius:20px;
    padding:25px;
    box-shadow:var(--shadow);
    transition:.3s;
}

.profession-card:hover{
    transform:translateY(-6px);
    box-shadow:0 20px 45px rgba(0,0,0,.12);
}

.profession-card h3{
    font-size:20px;
    margin-bottom:8px;
    color:var(--primary);
}

.profession-intro{
    color:var(--gray);
    font-weight:600;
    margin-bottom:10px;
}

.profession-tasks{
    list-style:none;
    margin-bottom:18px;
}

.profession-tasks li{
    color:var(--gray);
    line-height:1.9;
    padding-left:26px;
    position:relative;
}

.profession-tasks li::before{
    content:"✔";
    position:absolute;
    left:0;
    color:#22c55e;
    font-weight:700;
}

.profession-suggest{
    border-top:1px solid var(--border);
    padding-top:16px;
}

.suggest-label{
    display:block;
    font-size:13px;
    color:var(--gray);
    font-weight:600;
    margin-bottom:10px;
}

.chip-row{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
}

.chip{
    background:#eff6ff;
    color:var(--primary);
    font-size:13px;
    font-weight:600;
    padding:7px 14px;
    border-radius:50px;
    cursor:pointer;
    transition:.25s;
}

.chip:hover{
    background:var(--primary);
    color:white;
    transform:translateY(-2px);
}

body.dark .profession-suggest{
    border-top-color:#334155;
}

body.dark .chip{
    background:#334155;
    color:#93c5fd;
}

/* =======================================
BẢNG XẾP HẠNG AI
======================================= */
.ranking-list{
    display:flex;
    flex-direction:column;
    gap:14px;
}

.ranking-item{
    background:white;
    border-radius:16px;
    padding:16px 22px;
    box-shadow:0 8px 24px rgba(0,0,0,.06);
    display:flex;
    align-items:center;
    gap:20px;
    transition:.3s;
}

.ranking-item:hover{
    transform:translateX(6px);
    box-shadow:0 12px 30px rgba(0,0,0,.1);
}

.rank-pos{
    width:40px;
    min-width:40px;
    height:40px;
    border-radius:50%;
    background:#f1f5f9;
    display:flex;
    align-items:center;
    justify-content:center;
    font-weight:700;
    font-size:18px;
    color:var(--gray);
}

.rank-pos.rank-top{
    background:linear-gradient(135deg,#fef3c7,#fde68a);
    font-size:22px;
}

.ranking-logo{
    width:48px;
    height:48px;
    min-width:48px;
    border-radius:12px;
    background:linear-gradient(135deg,#eff6ff,#dbeafe);
    display:flex;
    align-items:center;
    justify-content:center;
}

.ranking-logo img{
    width:28px;
    height:28px;
    object-fit:contain;
}

.ranking-info{
    flex:1;
    min-width:120px;
}

.ranking-info h4{
    font-size:17px;
    margin-bottom:3px;
}

.ranking-category{
    font-size:13px;
    color:var(--gray);
}

.ranking-rating{
    font-weight:700;
    color:#f59e0b;
    min-width:70px;
}

.ranking-link{
    width:auto;
    padding:10px 20px;
    font-size:14px;
}

body.dark .ranking-item{
    background:#1e293b;
}

body.dark .rank-pos{
    background:#334155;
    color:#e2e8f0;
}

/* =======================================
TOOL GRID
======================================= */
.tool-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
    gap:20px;
}

.tool-card{
    background:#fff;
    border-radius:20px;
    overflow:hidden;
    box-shadow:0 10px 30px rgba(0,0,0,.08);
    transition:.35s;
    position:relative;
    animation:fadeUp .6s ease;
}

.tool-card:hover{
    transform:translateY(-10px);
    box-shadow:0 20px 45px rgba(0,0,0,.15);
}

.tool-image{
    height:180px;
    background:linear-gradient(135deg,#eff6ff,#dbeafe);
    display:flex;
    justify-content:center;
    align-items:center;
}

.tool-image img,
.tool-image .tool-logo{
    width:70px;
    height:70px;
    object-fit:contain;
}

.tool-content{
    padding:25px;
}

.tool-content h3{
    font-size:24px;
    margin-bottom:10px;
}

.tool-content p{
    color:#64748b;
    line-height:1.8;
    margin-bottom:20px;
    min-height:70px;
}

/* =======================================
BADGE
======================================= */
.badge{
    position:absolute;
    top:18px;
    right:18px;
    background:#22c55e;
    color:white;
    font-size:13px;
    padding:6px 12px;
    border-radius:50px;
    font-weight:600;
    z-index:2;
}

.badge.pro{
    background:#ef4444;
}

.badge.free{
    background:#2563eb;
}

.badge.hot{
    background:#22c55e;
}

.favorite-btn{
    position:absolute;
    top:16px;
    left:16px;
    width:38px;
    height:38px;
    border:0;
    border-radius:50%;
    background:rgba(255,255,255,.9);
    color:#64748b;
    font-size:25px;
    line-height:1;
    box-shadow:0 4px 12px rgba(15,23,42,.12);
    transition:.2s;
    z-index:3;
}

.favorite-btn:hover,
.favorite-btn.is-favorite{
    color:#e11d48;
    transform:scale(1.08);
}

/* =======================================
RATING
======================================= */
.rating{
    display:flex;
    align-items:center;
    gap:6px;
    margin-bottom:15px;
    color:#f59e0b;
    font-weight:600;
}

.rating span{
    color:#475569;
}

/* =======================================
BUTTON
======================================= */
.btn{
    display:inline-block;
    width:100%;
    text-align:center;
    background:#2563eb;
    color:white;
    padding:14px;
    border-radius:12px;
    transition:.3s;
    font-weight:600;
}

.btn:hover{
    background:#1d4ed8;
}

/* =======================================
EMPTY
======================================= */
.empty{
    background:white;
    padding:80px;
    border-radius:20px;
    text-align:center;
    box-shadow:var(--shadow);
    grid-column:1/-1;
}

/* =======================================
ANIMATION
======================================= */
@keyframes fadeUp{
    from{
        opacity:0;
        transform:translateY(30px);
    }
    to{
        opacity:1;
        transform:translateY(0);
    }
}

/* =======================================
6 Ô LỢI ÍCH CUỐI TRANG
======================================= */
.footer-stats{
    max-width:1160px;
    margin:0 auto;
    padding:0 20px 60px;
    display:grid;
    grid-template-columns:repeat(6,1fr);
    gap:20px;
}

.stat-box{
    background:white;
    border-radius:18px;
    padding:26px 20px;
    text-align:center;
    box-shadow:var(--shadow);
    transition:.3s;
}

.stat-box:hover{
    transform:translateY(-6px);
    box-shadow:0 20px 45px rgba(0,0,0,.12);
}

.stat-icon{
    width:56px;
    height:56px;
    margin:0 auto 14px;
    border-radius:50%;
    background:linear-gradient(135deg,#eff6ff,#dbeafe);
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:26px;
}

.stat-box h4{
    font-size:16px;
    margin-bottom:8px;
}

.stat-box p{
    font-size:13px;
    color:var(--gray);
    line-height:1.6;
}

body.dark .stat-box{
    background:#1e293b;
}

body.dark .stat-box p{
    color:#94a3b8;
}

@media(max-width:1200px){
    .footer-stats{
        grid-template-columns:repeat(3,1fr);
    }
}

@media(max-width:600px){
    .footer-stats{
        grid-template-columns:repeat(2,1fr);
        gap:14px;
    }
}

/* =======================================
FOOTER
======================================= */
footer{
    margin-top:80px;
    background:#0f172a;
    color:white;
    text-align:center;
    padding:50px;
}

footer p{
    opacity:.8;
}

footer .credit{
    margin-top:8px;
    font-size:13px;
    opacity:.55;
}

footer .credit a{
    text-decoration:underline;
}

/* =======================================
SCROLLBAR
======================================= */
::-webkit-scrollbar{
    width:10px;
}

::-webkit-scrollbar-thumb{
    background:#2563eb;
    border-radius:20px;
}

::-webkit-scrollbar-track{
    background:#edf2f7;
}

/* =======================================
DARK MODE
======================================= */
body.dark{
    background:#0f172a;
    color:#e2e8f0;
}

body.dark .header{
    background:#1e293b;
}

body.dark .sidebar,
body.dark .knowledge-card,
body.dark .tool-card,
body.dark .empty{
    background:#1e293b;
    color:#e2e8f0;
}

body.dark .tool-content p,
body.dark .knowledge-card p,
body.dark .knowledge-card ul,
body.dark .rating span{
    color:#94a3b8;
}

body.dark .favorite-btn{
    background:#334155;
    color:#cbd5e1;
}

body.dark .favorite-btn.is-favorite{
    color:#fb7185;
}

.back-to-top{
    position:fixed;
    right:24px;
    bottom:24px;
    width:46px;
    height:46px;
    border:0;
    border-radius:50%;
    background:var(--primary);
    color:#fff;
    font-size:25px;
    box-shadow:0 10px 25px rgba(37,99,235,.35);
    opacity:0;
    pointer-events:none;
    transform:translateY(12px);
    transition:.25s;
    z-index:10;
}

.back-to-top.show{
    opacity:1;
    pointer-events:auto;
    transform:translateY(0);
}

body.dark footer{
    background:#020617;
}

/* =======================================
RESPONSIVE
======================================= */
@media(max-width:1200px){
    .main{
        grid-template-columns:220px 1fr;
    }
}

@media(max-width:900px){
    .main{
        grid-template-columns:1fr;
    }

    .quick-utilities{
        display:flex;
        grid-column:1/-1;
        gap:8px;
        overflow-x:auto;
        padding:2px 2px 10px;
        scrollbar-width:thin;
    }

    .quick-utilities button{
        flex:0 0 auto;
        border:1px solid var(--border);
        border-radius:999px;
        background:var(--white);
        color:var(--text);
        padding:10px 14px;
        font:inherit;
        font-size:13px;
        font-weight:600;
        white-space:nowrap;
    }

    .quick-utilities button.active{
        background:var(--primary);
        color:#fff;
        border-color:var(--primary);
    }

    body.dark .quick-utilities button{
        background:#1e293b;
        color:#e2e8f0;
        border-color:#334155;
    }

    .mobile-toggle-btn{
        display:flex;
    }

    .sidebar{
        display:none;
        position:relative;
        top:0;
    }

    .sidebar.sidebar-open{
        display:block;
    }

    .hero h1{
        font-size:42px;
    }

    .hero-robot{
        width:140px;
        height:140px;
        right:10px;
        bottom:-6px;
        opacity:.5;
    }

    .search-box{
        flex-direction:column;
        gap:10px;
    }

    .search-box input{
        width:100%;
        border-radius:12px;
    }

    .search-box button{
        width:100%;
        height:55px;
        border-radius:12px;
    }

    .search-box .clear-search{
        right:12px;
        top:28px;
        width:30px;
        height:30px;
    }

    .section-title{
        align-items:flex-start;
        flex-direction:column;
        gap:12px;
    }
}

@media(max-width:600px){
    .header{
        padding:20px;
    }

    body.compact .header{
        height:64px;
        padding:12px 16px;
    }

    body.compact .logo{font-size:19px}
    body.compact .header-right{gap:6px}
    body.compact .header-right button{padding:7px 10px;font-size:15px}
    body.compact .hero{min-height:320px;padding:40px 20px}
    body.compact .hero h1{font-size:28px}
    body.compact .hero p{font-size:15px}
    body.compact .main{margin:28px auto;padding:0 14px}
    body.compact .section-title h2{font-size:27px}
    body.compact .tool-content{padding:16px}

    nav{
        display:none;
    }

    #mobileMenuBtn{
        display:block;
    }

    nav.nav-open{
        display:flex;
        flex-direction:column;
        gap:6px;
        position:absolute;
        top:80px;
        left:0;
        right:0;
        background:white;
        padding:16px 20px 22px;
        box-shadow:0 15px 30px rgba(0,0,0,.12);
        z-index:998;
    }

    nav.nav-open a{
        padding:12px 10px;
        border-radius:10px;
    }

    nav.nav-open a:hover{
        background:#eff6ff;
    }

    body.dark nav.nav-open{
        background:#1e293b;
    }

    body.dark nav.nav-open a:hover{
        background:#334155;
    }

    .hero{
        padding:50px 25px;
    }

    .hero h1{
        font-size:34px;
    }

    .tool-grid{
        grid-template-columns:1fr;
    }

    .hero-robot{
        display:none;
    }
}

.tool-buttons{display:flex;gap:10px;margin-top:12px}
.tool-buttons .btn{flex:1;text-align:center}
.btn-free{background:#22c55e!important}
.btn-paid{background:#8b5cf6!important}

/* =======================================
LOADING SCREEN
======================================= */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f4f7fb 0%, #e8eef8 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-container {
    text-align: center;
}

.loading-robot {
    width: 80px;
    height: 100px;
    margin: 0 auto 20px;
    position: relative;
    animation: robotBounce 2s ease-in-out infinite;
}

.robot-head {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    border-radius: 12px;
    margin: 0 auto 8px;
    position: relative;
}

.robot-eye {
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 20px;
    animation: blink 2s infinite;
}

.robot-eye-left {
    left: 14px;
}

.robot-eye-right {
    right: 14px;
}

.robot-body {
    width: 40px;
    height: 30px;
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    border-radius: 8px;
    margin: 0 auto;
    position: relative;
}

.robot-limb {
    width: 4px;
    height: 20px;
    background: #2563eb;
    position: absolute;
    bottom: -20px;
    animation: limbSwing 1s ease-in-out infinite;
}

.robot-limb-left {
    left: 6px;
    animation-direction: normal;
}

.robot-limb-right {
    right: 6px;
    animation-direction: reverse;
}

.loading-text {
    font-size: 16px;
    color: #2563eb;
    margin: 30px 0 20px;
    font-weight: 600;
    letter-spacing: 2px;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: #e5e7eb;
    border-radius: 2px;
    margin: 0 auto;
    overflow: hidden;
}

.loading-progress {
    height: 100%;
    background: linear-gradient(90deg, #2563eb 0%, #3b82f6 100%);
    border-radius: 2px;
    animation: progress 2s ease-in-out infinite;
}

@keyframes robotBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes blink {
    0%, 48%, 52%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes limbSwing {
    0%, 100% { transform: rotate(0deg); }
    50% { transform: rotate(30deg); }
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 100%; }
    100% { width: 0%; }
}

@media (max-width: 600px) {
    .loading-robot {
        width: 60px;
        height: 80px;
    }

    .robot-head {
        width: 50px;
        height: 50px;
    }

    .loading-bar {
        width: 150px;
    }
}

/* =======================================
ENHANCED ANIMATIONS & TRANSITIONS
======================================= */

/* Smooth entrance animations */
.tool-card {
    animation: slideInUp 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.knowledge-item {
    animation: slideInUp 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Optimized transitions */
button, a {
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.tool-card:hover {
    transform: translateY(-8px) scale(1.02);
    animation: none;
}

/* Subtle scale animation on load */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =======================================
KHU VỰC QUẢNG CÁO 2 BÊN (chỉ hiện khi màn hình đủ rộng)
======================================= */
.ad-slot{
    position:fixed;
    top:120px;
    width:160px;
    min-height:600px;
    background:var(--white);
    border:2px dashed var(--border);
    border-radius:var(--radius);
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    padding:10px;
    color:var(--gray);
    font-size:14px;
    font-weight:500;
    line-height:1.5;
    z-index:80;
}

.ad-slot-left{ left:20px; }
.ad-slot-right{ right:20px; }

body.dark .ad-slot{
    background:#1e293b;
    border-color:#334155;
    color:#94a3b8;
}

/* Chỉ hiện quảng cáo khi màn hình đủ rộng để không đè lên nội dung chính
   (nội dung chính rộng tối đa 1160px, mỗi bên cần thêm ~200px cho quảng cáo) */
@media(max-width:1650px){
    .ad-slot{ display:none; }
}