/*** This is the css file for all my webpages ***/
.lightmode {
    --text-color: #228;
    --bg-color: #efd;
    --bg-color-alt: #e8e8e8;
    --border-color: #344;
    --border-color-alt: #688;
    --head-color-alt: #486;
    --head-color: #c42;
    --special-color: salmon;
}

.darkmode {
    --text-color: #efd;
    --bg-color-alt: #224;
    --bg-color: #242;
    --border-color: #e8e8f0;
    --border-color-alt: #747480;
    --head-color-alt: #cfe;
    --head-color: #f8e;
    --special-color: #c0ff00;
}

.hyderabadi {
    --text-color: brown;
    --bg-color: #f0d0a0;
    --bg-color-alt: #d0d0d8;
    --border-color: #d88080;
    --border-color-alt: #707096;
    --head-color: #408040;
    --head-color-alt: #406080;
    --special-color: teal;
}

.maincard {
    position: fixed; top: 96px; left: 10%;
    height: 74%; width: 80%;
    max-width: 1200px;
    padding: 0px;
    box-shadow: 0px 0px 16px 4px var(--border-color);
    border-radius: 16px;
    border: 1px solid var(--border-color-alt);
    overflow: auto;
    scrollbar-width: none;
    &::-webkit-scrollbar {
        display: none;
    }
    background-color: var(--bg-color-alt);
}

/* Glass Card Style */
.glass-box {
    flex: 1;
    backdrop-filter: blur(3px);
    border: 1px solid var(--border-color);
    box-shadow: 0px 0px 2px var(--border-color);
                inset 0 0 2px 2px var(--bg-color-alt); 
    border-radius: 24px;
    padding: 24px;

    min-width: 350px;
    background-color: var(--bg-color-alt);
    line-height: 1.6;
}
.glass-box:hover {
    background-color: var(--bg-color);
    backdrop-filter: blur(6px);
    box-shadow: 0px 0px 6px 4px var(--border-color);
}
.glass-box h2, .glass-box h3 {
    color: #48bfaf;
    margin-top: 0;
    text-shadow: 3px 3px 0px var(--bg-color-alt);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 18px;
    line-height: 1.24;
}

/* Navigation Bar */
header {
    position: sticky;
    top: 0;
    background: linear-gradient(90deg, var(--border-color),
                                var(--border-color-alt));
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(-border-color);
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.25rem 2rem;
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--special-color);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

a {
    color: var(--special-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--head-color);
}

.nav-links a {
    color: white;;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: yellow;
}

/* Hero Section */
.hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    text-align: center;
    background: inherit;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, var(--head-color),
                                var(--head-color-alt));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    color: var(--text-color);
    font-size: 1.25rem;
    max-width: 650px;
    margin: 0 auto;
}

/* Layout Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem 4rem 2rem;
}

section {
    padding: 48px 32px 18px 32px;
}

/* Card Section Component */
.section-card {
    background-color: var(--bg-color);
    /* border: 1px solid var(--border-color); */
    border-radius: 36px;
    padding: 18px;
    margin-top: 2.5rem;
    margin-bottom: 2.5rem;
/* background: url('linux_os_02.png') top / cover
        no-repeat; */
}

.section-title {
    font-size: 1.5rem;
    margin-bottom: 1.2rem;
    color: var(--head-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

/* Syllabus Grid */
.syllabus-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.module-card {
    background-color: var(--bg-color-alt);
    border: 1px solid var(--border-color);
    padding: 1.25rem;
/*    box-shadow: 0px 0px 8px 0px var(--head-color); */
    border-radius: 16px;
    color: var(--text-color);
}

.module-card:hover {
    box-shadow: 0px 0px 12px 2px var(--border-color-alt);
}

.module-card h3 {
    background: linear-gradient(90deg, var(--head-color-alt),
                                var(--head-color));
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Tables for Schedule & Assignments */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    text-align: left;
}

.data-table th, .data-table td {
    padding: 0.85rem;
    border-bottom: 1px solid var(--special-color);
}

.data-table th {
    color: var(--accent-cyan);
    font-weight: 600;
}

.data-table tr:hover {
    background-color: rgba(56, 189, 248, 0.075);
}

.data-table .spectext {
    color: var(--border-color-alt);
    font-weight: bold;
}

footer {
    display: flex;
    gap: 10rem;
    list-style: none;
    position: fixed; bottom:0px; width: 100%;
    background: linear-gradient(90deg, var(--border-color-alt),
                                var(--border-color));
    border-top: 1px solid var(--border-color-alt);
    text-align: center;
    padding: 0.25rem;
    color: var(--bg-color);
    font-size: 0.8rem;
}

/* Student Grid */
.student-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(108px, 1fr));
    gap: 1rem;
}

.student-chip {
    background-color: var(--bg-color-alt);
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.5rem;
    border-radius: 6px;
    text-align: center;
    font-size: 0.9rem;
}
.student-chip:hover {
    background-color: var(--bg-color-alt);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* Can be expanded with CSS-only 
                                       hamburger menu if needed */
    }
    .hero h1 {
        font-size: 2rem;
    }
    .data-table {
        font-size: 0.85rem;
    }
}