* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: 'Segoe UI', Arial, sans-serif;
  /*background-color: #0f172a;*/
    color: #f8fafc;
    padding: 2rem 1rem;
}
.main-container {
   /* max-width: 1100px;*/
    max-width:2200px;
    margin: 0 auto;
color:#f8fafc;
}
.page-title {
    font-size: 5.2rem;
    font-weight: 1000;
    text-align: center;
    margin-bottom: 2rem;
  color: #ffffff;
}

.main-container h1 {
    font-size: 2rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: #38bdf8;
text-align: center;
}

.main-container p {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: #2b16c7;
text-align: left;
}

.tabs-container {
    width: 100%;
   /* background-color: #1e293b; */
    border: 1px solid #334155;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}
.tabs-nav {
    display: flex;
    background-color: #0f172a;
    border-bottom: 1px solid #334155;
    overflow-x: auto;
    scrollbar-width: none;
}
.tabs-nav::-webkit-scrollbar {
    display: none;
}
.tab-link {
    flex: 1;
    min-width: 160px;
    background: none;
    border: none;
    outline: none;
    padding: 1.2rem 1rem;
    color: #94a3b8;
    font-size: 1.25rem;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    transition: color 0.2s, background-color 0.2s;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
}
.tab-link:hover {
    color: #f8fafc;
    background-color: rgba(255, 255, 255, 0.02);
}
.tab-link.active {
    color: #3b82f6;
    background-color: rgba(59, 130, 246, 0.05);
    border-bottom: 3px solid #3b82f6;
}
.tabs-content-wrapper {
    padding: 2.5rem;
}
.tab-panel {
    display: none;
    animation: tabFadeIn 0.4s ease-out forwards;
}
.tab-panel.active {
    display: block;
}
.tab-panel h3 {
    color: #3b82f6;
    font-size: 1.8rem;
    margin-bottom: 1.2rem;
    font-weight: 600;
}
.subject-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}
.subject-item {
    background-color: #0f172a;
    border: 1px solid #334155;
    border-radius: 8px;
    transition: border-color 0.2s, transform 0.2s;
}
.subject-item:hover {
    border-color: #3b82f6;
    transform: translateX(4px);
}
.subject-link {
    display: flex;
    align-items: center;
    padding: 1rem 1.2rem;
    width: 100%;
    height: 100%;
    color: #e2e8f0;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 400;
}
.subject-link::before {
    content: "→";
    color: #3b82f6;
    font-weight: bold;
    font-size: 1.2rem;
    margin-right: 0.75rem;
    transition: transform 0.2s ease;
}
.subject-item:hover .subject-link::before {
    transform: translateX(3px);
}
@keyframes tabFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hero and Title Layout */
.blog-hero {
    max-width: 1200px;
    margin: 3rem auto 2rem auto;
    padding: 0 1.5rem;
    text-align: center;
}
.blog-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: #38bdf8;
}
.blog-hero p {
   /* color: #94a3b8;*/
color:#38bdf8;
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}