*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}

/* ===== تنظیمات کلی و فونت ===== */
body{
    font-family:Tahoma,"Segoe UI",Arial,sans-serif;
    background-color:#0a0a0a;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 255, 136, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 200, 255, 0.05) 0%, transparent 40%);
    background-attachment: fixed;
    color:#d1d5db;
    line-height:2;
    min-height: 100vh;
    transition: background-color 0.4s ease, color 0.4s ease;
}
a{text-decoration:none;color:inherit;transition: all 0.3s ease;}
button,input{font-family:inherit;}
.container{width:min(1160px,92%);margin:auto;}

/* ===== هدر ===== */
header{
    position:relative;
    z-index:50;
    background:rgba(15,15,15,0.85);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    border-bottom:1px solid rgba(0, 255, 136, 0.3);
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    transition: background 0.4s ease, border-color 0.4s ease;
}
nav{height:72px;display:flex;align-items:center;justify-content:space-between;}

/* ===== منو ===== */
.menu{display:flex;gap:28px;list-style:none;font-size:14px;font-weight:700;}
.menu a{
    color:#d1d5db;
    position: relative;
    padding-bottom: 4px;
}
.menu a::after{
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 2px;
    background: #00ff88;
    transition: width 0.3s ease;
}
.menu a:hover{color:#00ff88;}
.menu a:hover::after{width: 100%;}

/* ===== دکمه تغییر تم ===== */
.theme-toggle{
    background: rgba(26,26,26,0.8);
    border: 1px solid rgba(0,255,136,0.25);
    color: #d1d5db;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    margin-right: 16px;
}
.theme-toggle:hover{
    border-color: #00ff88;
    background: rgba(0,255,136,0.1);
    transform: rotate(20deg) scale(1.1);
    box-shadow: 0 0 20px rgba(0,255,136,0.3);
}

/* ===== بخش Hero ===== */
.hero{
    position:relative;overflow:hidden;
    background:rgba(15,15,15,0.6);
    backdrop-filter: blur(10px);
    padding:80px 0 70px;
    border-bottom:1px solid rgba(0,255,136,0.2);
}
.hero:before,.hero:after{
    content:"";position:absolute;border-radius:50%;
    filter:blur(60px);opacity:0.15;
}
.hero:before{width:400px;height:400px;background:#00ff88;left:-150px;top:-150px;}
.hero:after{width:300px;height:300px;background:#00ccff;right:-120px;bottom:-120px;}
.hero-content{position:relative;z-index:2;max-width:900px;margin:auto;text-align:center;}

/* دکمه بالای هدر */
.tag{
    display:inline-block;
    color:#00ff88;
    background:rgba(0,255,136,0.1);
    border:1px solid rgba(0,255,136,0.4);
    padding:6px 16px;
    border-radius:50px;
    font-size:13px;
    font-weight:800;
    margin-bottom:20px;
    letter-spacing: 0.5px;
    backdrop-filter: blur(5px);
}

/* ===== تیتر اصلی ===== */
h1{
    font-size:clamp(34px,7vw,64px);
    line-height:1.3;
    letter-spacing:-2px;
    margin-bottom:20px;
    background: linear-gradient(135deg, #00ff88 0%, #00ccff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 900;
}
.highlight{
    background: linear-gradient(135deg, #00ccff 0%, #00ff88 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p{font-size:18px;color:#a0a5ab;max-width:760px;margin:auto;}

/* ===== عنوان بخش‌ها ===== */
section{padding:80px 0;}
.section-head{text-align:center;margin-bottom:45px;}
.section-head h2{
    font-size:34px;
    line-height:1.4;
    color:#00ff88;
    text-shadow: 0 0 20px rgba(0,255,136,0.2);
}
.section-head p{color:#a0a5ab;margin-top:8px;font-size:16px;}

/* ===== جستجو ===== */
.search{
    display:flex;
    gap:12px;
    max-width:760px;
    margin:35px auto 0;
}
.search input{
    flex:1;
    padding:16px 20px;
    border:1px solid rgba(255,255,255,0.1);
    border-radius:12px;
    font-size:15px;
    outline:none;
    background:rgba(26,26,26,0.8);
    color:#d1d5db;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
    font-family: inherit;
}
.search input:focus{
    border-color:#00ff88;
    box-shadow:0 0 0 4px rgba(0,255,136,0.15);
    background:rgba(26,26,26,1);
}
.search button{
    border:0;
    border-radius:12px;
    background:linear-gradient(135deg, #00ff88, #00cc6a);
    color:#0a0a0a;
    padding:0 28px;
    font-weight:bold;
    cursor:pointer;
    font-size: 15px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,255,136,0.3);
    font-family: inherit;
}
.search button:hover{
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,255,136,0.5);
}

/* ===== نتایج جستجو ===== */
#results{
    max-width:760px;
    margin:15px auto 0;
    text-align:right;
}
.result{
    display:block;
    background:rgba(26,26,26,0.7);
    border:1px solid rgba(255,255,255,0.08);
    border-radius:12px;
    padding:14px 18px;
    margin:8px 0;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}
.result:hover{
    border-color:#00ff88;
    background:rgba(30,30,30,0.9);
    transform: translateX(-5px);
    box-shadow: 0 4px 15px rgba(0,255,136,0.1);
}
.result b{display:block;color:#00ff88;font-size:16px;}
.result small{display:block;color:#00ccff;font-size:12px;margin:2px 0;}
.result span{display:block;color:#a0a5ab;font-size:13px;}
.no{
    text-align:center;
    color:#a0a5ab;
    padding:15px;
}

/* ===== فیلترها ===== */
.filters{
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    gap:12px;
    margin-top:30px;
}
.filters button{
    background: rgba(26, 26, 26, 0.8);
    color: #d1d5db;
    border: 1px solid rgba(0, 255, 136, 0.25);
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
    font-family: inherit;
}
.filters button:hover{
    border-color: #00ff88;
    color: #00ff88;
    background: rgba(0, 255, 136, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 255, 136, 0.2);
}

/* ===== دسته‌های علمی ===== */
.categories h2{
    text-align: center;
    font-size: 34px;
    color: #00ff88;
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(0, 255, 136, 0.2);
}
.categoryGrid{
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 30px;
}
.categoryGrid button{
    background: rgba(26, 26, 26, 0.8);
    color: #d1d5db;
    border: 1px solid rgba(0, 255, 136, 0.25);
    padding: 12px 22px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
    font-family: inherit;
}
.categoryGrid button:hover{
    border-color: #00ff88;
    color: #00ff88;
    background: rgba(0, 255, 136, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 255, 136, 0.2);
}

/* ===== عنوان بخش موضوعات ===== */
.head{
    text-align: center;
    margin-bottom: 45px;
}
.head h2{
    font-size: 34px;
    color: #00ff88;
    text-shadow: 0 0 20px rgba(0, 255, 136, 0.2);
}
.head p{
    color: #a0a5ab;
    margin-top: 8px;
    font-size: 16px;
}

/* ===== کارت‌ها ===== */
.cards{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card, .topic-card, .box, 
article, .item, .post {
    background:rgba(26,26,26,0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0,255,136,0.15);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.card::before, .topic-card::before, article::before, .item::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, #00ff88, transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover, .topic-card:hover, .box:hover,
article:hover, .item:hover, .post:hover {
    border-color: rgba(0,255,136,0.6);
    box-shadow: 0 8px 30px rgba(0,255,136,0.15);
    transform: translateY(-5px);
    background:rgba(30,30,30,0.8);
}
.card:hover::before, .topic-card:hover::before, article:hover::before {
    opacity: 1;
}

.card h2, .card h3, .topic-card h2, .topic-card h3,
article h2, article h3, .item h2, .item h3 {
    color: #00ff88 !important;
    margin-bottom: 12px;
    font-size: 1.3em;
    font-weight: 800;
    text-shadow: 0 0 10px rgba(0,255,136,0.1);
}

.card p, .topic-card p, article p, .item p {
    color: #d1d5db !important;
    margin-bottom: 12px;
    line-height: 1.9;
    font-size: 15px;
}

.card a, .topic-card a, article a, .item a {
    color: #00ff88 !important;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 8px;
    padding: 6px 12px;
    border-radius: 8px;
    background: rgba(0,255,136,0.08);
    transition: all 0.3s ease;
    font-size: 14px;
}
.card a:hover, .topic-card a:hover, article a:hover, .item a:hover {
    background: rgba(0,255,136,0.2);
    transform: translateX(-5px);
    box-shadow: 0 0 15px rgba(0,255,136,0.2);
}

.card > span:first-of-type {
    display: inline-block;
    color: #00ccff;
    background: rgba(0, 204, 255, 0.08);
    border: 1px solid rgba(0, 204, 255, 0.25);
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 700;
    margin-bottom: 10px;
}

/* ===== بخش درباره ===== */
.about{
    text-align: center;
}
.about h2{
    color: #00ff88;
    margin-bottom: 15px;
    font-size: 28px;
}
.about p{
    color: #a0a5ab;
    max-width: 700px;
    margin: auto;
}

/* ===== فوتر ===== */
footer {
    text-align: center;
    padding: 30px 0;
    border-top: 1px solid rgba(0,255,136,0.15);
    color: #a0a5ab;
    font-size: 14px;
    background: rgba(10,10,10,0.8);
    backdrop-filter: blur(10px);
    transition: background 0.4s ease;
}

/* ===== اسکرول‌بار ===== */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: #0a0a0a;
}
::-webkit-scrollbar-thumb {
    background: #2e7d32;
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: #00ff88;
}

/* ========================================================= */
/* ===== تم روشن (Light Mode) ===== */
/* ========================================================= */
body.light-mode{
    background-color:#f5f7fa;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 179, 107, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 136, 204, 0.06) 0%, transparent 40%);
    color:#1a1a2e;
}
body.light-mode header{
    background:rgba(255,255,255,0.9);
    border-bottom-color: rgba(0, 179, 107, 0.3);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
body.light-mode .logo-text b{
    -webkit-text-fill-color: #1a1a2e;
    color: #1a1a2e;
}
body.light-mode .menu a{
    color:#1a1a2e;
}
body.light-mode .hero{
    background:rgba(255,255,255,0.6);
    border-bottom-color: rgba(0, 179, 107, 0.2);
}
body.light-mode .hero p{
    color:#5a6270;
}
body.light-mode .tag{
    color:#00b36b;
    background:rgba(0, 179, 107, 0.1);
    border-color: rgba(0, 179, 107, 0.4);
}
body.light-mode h1{
    background: linear-gradient(135deg, #00b36b 0%, #0088cc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
body.light-mode .highlight{
    background: linear-gradient(135deg, #0088cc 0%, #00b36b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
body.light-mode .search input{
    background: rgba(255,255,255,0.9);
    color: #1a1a2e;
    border-color: rgba(0,0,0,0.1);
}
body.light-mode .search input:focus{
    background: #ffffff;
    border-color: #00b36b;
    box-shadow: 0 0 0 4px rgba(0, 179, 107, 0.15);
}
body.light-mode .search button{
    background: linear-gradient(135deg, #00b36b, #00cc6a);
}
body.light-mode .filters button,
body.light-mode .categoryGrid button{
    background: rgba(255,255,255,0.8);
    color: #1a1a2e;
    border-color: rgba(0, 179, 107, 0.3);
}
body.light-mode .filters button:hover,
body.light-mode .categoryGrid button:hover{
    border-color: #00b36b;
    color: #00b36b;
    background: rgba(0, 179, 107, 0.1);
}
body.light-mode .categories h2,
body.light-mode .head h2,
body.light-mode .section-head h2{
    color: #00b36b;
}
body.light-mode .head p,
body.light-mode .section-head p{
    color: #5a6270;
}
body.light-mode .card,
body.light-mode .topic-card,
body.light-mode article,
body.light-mode .item{
    background: rgba(255,255,255,0.8);
    border-color: rgba(0, 179, 107, 0.2);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
body.light-mode .card:hover,
body.light-mode .topic-card:hover,
body.light-mode article:hover,
body.light-mode .item:hover{
    background: #ffffff;
    border-color: rgba(0, 179, 107, 0.6);
    box-shadow: 0 8px 30px rgba(0, 179, 107, 0.15);
}
body.light-mode .card h2,
body.light-mode .card h3,
body.light-mode article h2,
body.light-mode article h3{
    color: #00b36b !important;
}
body.light-mode .card p,
body.light-mode article p{
    color: #1a1a2e !important;
}
body.light-mode .card a,
body.light-mode article a{
    color: #00b36b !important;
    background: rgba(0, 179, 107, 0.08);
}
body.light-mode .card a:hover,
body.light-mode article a:hover{
    background: rgba(0, 179, 107, 0.2);
}
body.light-mode .card > span:first-of-type{
    color: #0088cc;
    background: rgba(0, 136, 204, 0.08);
    border-color: rgba(0, 136, 204, 0.25);
}
body.light-mode .result{
    background: rgba(255,255,255,0.8);
    border-color: rgba(0,0,0,0.08);
}
body.light-mode .result:hover{
    background: #ffffff;
    border-color: #00b36b;
}
body.light-mode .result b{ color: #00b36b; }
body.light-mode .result small{ color: #0088cc; }
body.light-mode .result span{ color: #5a6270; }
body.light-mode .about h2{ color: #00b36b; }
body.light-mode .about p{ color: #5a6270; }
body.light-mode footer{
    background: rgba(255,255,255,0.9);
    border-top-color: rgba(0, 179, 107, 0.2);
    color: #5a6270;
}
body.light-mode ::-webkit-scrollbar-track{
    background: #f5f7fa;
}
body.light-mode ::-webkit-scrollbar-thumb{
    background: #b0b8c4;
}
body.light-mode ::-webkit-scrollbar-thumb:hover{
    background: #00b36b;
}
body.light-mode .theme-toggle{
    background: rgba(255,255,255,0.8);
    color: #1a1a2e;
    border-color: rgba(0, 179, 107, 0.3);
}
body.light-mode .theme-toggle:hover{
    border-color: #00b36b;
    background: rgba(0, 179, 107, 0.1);
    box-shadow: 0 0 20px rgba(0, 179, 107, 0.3);
}

/* ===== ریسپانسیو موبایل ===== */
@media (max-width: 640px){
    nav{
        height: auto;
        flex-direction: column;
        gap: 12px;
        padding: 12px 0;
        position: relative;
    }
    .menu{gap: 16px; font-size: 13px;}
    .search{flex-direction: column;}
    .search button{padding: 14px 20px;}
    .cards{grid-template-columns: 1fr;}
    section{padding: 50px 0;}
    .theme-toggle{
        position: absolute;
        top: 20px;
        left: 16px;
        margin-right: 0;
    }
}