/* ========================================
   Department of Mathematics
   Rangpur Govt. College
   Global Styles (Refactored)
======================================== */

:root {
    --primary: #003366;
    --secondary: #FFC107;
    --light: #F8F9FA;
    --dark: #212529;
    --white: #ffffff;
    --blue: #0d6efd;
    --shadow: 0 12px 35px rgba(0,0,0,.08);
    --radius: 22px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--light);
    color: var(--dark);
}

/* ---------- Top Header ---------- */
.top-header {
    background: #012a5e;
    color: #fff;
    font-size: .90rem;
    padding: 8px 0;
}
.top-header a {
    color: #fff;
    text-decoration: none;
    transition: .3s;
}
.top-header a:hover {
    color: var(--secondary);
}
.top-header i {
    color: var(--secondary);
    margin-right: 6px;
}

/* ---------- Navbar ---------- */
.navbar {
    background: var(--primary);
    padding: 12px 0;
    box-shadow: 0 2px 12px rgba(0,0,0,.15);
    position: sticky;
    top: 0;
    z-index: 999;
}
.navbar-brand {
    color: #fff;
    font-size: 1.35rem;
    font-weight: 700;
}
.navbar-brand:hover {
    color: var(--secondary);
}
.nav-link {
    color: #fff !important;
    font-weight: 500;
    margin-left: 8px;
    padding: 10px 15px !important;
    border-radius: 6px;
    transition: .3s;
}
.nav-link:hover,
.nav-link.active {
    background: var(--blue);
    color: #fff !important;
}
.navbar-toggler {
    border: none;
}
.navbar-toggler:focus {
    box-shadow: none;
}

/* ---------- Common Hero (Contact, Faculty, Resources) ---------- */
.contact-hero {
    position: relative;
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: 
        linear-gradient(rgba(0,40,90,.72), rgba(0,40,90,.72)),
        url("../assets/images/RGC Campus.jpg") 
        center center/cover;
}
.contact-hero .overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(255,193,7,.15), transparent 45%);
}
.contact-hero h1 {
    font-size: 3.6rem;
    font-weight: 700;
    letter-spacing: 1px;
}
.contact-hero p {
    font-size: 1.15rem;
    max-width: 760px;
    margin: auto;
}
.breadcrumb {
    margin-top: 20px;
}
.breadcrumb a {
    color: #fff;
    text-decoration: none;
}
.breadcrumb-item.active {
    color: var(--secondary);
}

/* ---------- About Hero ---------- */
.about-hero {
    position: relative;
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: 
        linear-gradient(rgba(0,40,90,.72), rgba(0,40,90,.72)),
        url("../assets/images/RGC Campus.jpg") 
        center center/cover;
}
.about-hero .overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(255,193,7,.15), transparent 45%);
}
.about-hero h1 {
    font-size: 3.6rem;
    font-weight: 700;
    letter-spacing: 1px;
}
.about-hero p {
    font-size: 1.15rem;
    max-width: 760px;
    margin: auto;
}

/* ---------- Buttons ---------- */
.btn-warning {
    padding: 12px 30px;
    border-radius: 40px;
    font-weight: 600;
}
.btn {
    border-radius: 40px;
    font-weight: 600;
}

/* ---------- Section Titles ---------- */
section {
    padding: 80px 0;
}
.section-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 20px;
}
.sub-title {
    display: inline-block;
    color: var(--blue);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 10px;
}
.section-tag {
    color: var(--blue);
    font-weight: 700;
    letter-spacing: 1px;
}

/* ---------- Common Stat Box ---------- */
.stat-box {
    background: #fff;
    border-radius: var(--radius);
    padding: 35px 25px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: .35s;
    height: 100%;
}
.stat-box:hover {
    transform: translateY(-8px);
    box-shadow: 0 18px 40px rgba(0,0,0,.15);
}
.stat-box i {
    font-size: 2.6rem;
    color: var(--blue);
    margin-bottom: 20px;
}
.stat-box h2 {
    font-size: 2.3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}
.stat-box p {
    margin: 0;
    color: #666;
    font-weight: 500;
}

/* ---------- Common Faculty Card ---------- */
.faculty-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: .4s;
    height: 100%;
}
.faculty-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 45px rgba(0,0,0,.18);
}
.faculty-card img {
    width: 100%;
    height: 360px;
    object-fit: cover;
    transition: .5s;
}
.faculty-card:hover img {
    transform: scale(1.05);
}
.faculty-content {
    padding: 28px;
}
.faculty-content h4 {
    color: var(--primary);
    font-weight: 700;
}
.faculty-content span {
    color: var(--blue);
    font-weight: 600;
}
.faculty-body {
    padding: 30px;
}
.faculty-name {
    color: var(--primary);
    font-size: 1.45rem;
    font-weight: 700;
    margin-bottom: 6px;
}
.faculty-position {
    color: #666;
    font-weight: 500;
    margin-bottom: 20px;
}
.faculty-info p {
    margin-bottom: 15px;
    color: #555;
    line-height: 1.7;
}
.faculty-info i {
    width: 24px;
    color: var(--blue);
}
.faculty-info a {
    color: var(--primary);
    text-decoration: none;
}
.faculty-info a:hover {
    color: var(--blue);
}

/* ---------- Contact Box ---------- */
.contact-box {
    background: #fff;
    border-radius: 20px;
    padding: 35px 25px;
    text-align: center;
    transition: .35s;
    box-shadow: var(--shadow);
    height: 100%;
}
.contact-box:hover {
    transform: translateY(-10px);
    box-shadow: 0 18px 45px rgba(0,0,0,.12);
}
.contact-box .icon {
    width: 75px;
    height: 75px;
    margin: auto;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    margin-bottom: 22px;
}
.contact-box h4 {
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 15px;
}
.contact-box p {
    margin: 0;
    color: #666;
}
.contact-box a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}
.contact-box a:hover {
    color: var(--blue);
}

/* ---------- Staff Card ---------- */
.staff-card {
    background: #fff;
    border: none;
    border-radius: 24px;
    overflow: hidden;
    transition: .35s;
    box-shadow: var(--shadow);
}
.staff-card:hover {
    transform: translateY(-8px);
}
.staff-photo {
    width: 100%;
    height: 100%;
    min-height: 320px;
    object-fit: cover;
}
.staff-card .card-body {
    padding: 35px;
}
.staff-card h3 {
    color: var(--primary);
    font-weight: 700;
}
.staff-card p {
    color: #666;
}
.staff-card .badge {
    font-size: .85rem;
    padding: 8px 14px;
    border-radius: 40px;
}

/* ---------- CTA (Home & Contact) ---------- */
.contact-cta {
    background: linear-gradient(135deg, var(--primary), #0B3D91);
    color: #fff;
    padding: 70px 0;
}
.contact-cta h2 {
    font-weight: 700;
    margin-bottom: 15px;
}
.contact-cta p {
    opacity: .9;
    margin-bottom: 0;
}
.contact-cta .btn {
    font-weight: 600;
    padding: 14px 35px;
    border-radius: 50px;
}

/* ---------- History Card (About) ---------- */
.history-card {
    background: #fff;
    border-radius: 20px;
    padding: 35px;
    height: 100%;
    transition: .35s;
    box-shadow: var(--shadow);
}
.history-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 45px rgba(0,0,0,.15);
}
.history-year {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 22px;
    margin-bottom: 25px;
}

/* ---------- Feature Card (About) ---------- */
.feature-card {
    background: #fff;
    padding: 35px;
    border-radius: 18px;
    text-align: center;
    transition: .35s;
    box-shadow: var(--shadow);
}
.feature-card:hover {
    transform: translateY(-8px);
}
.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    margin: auto auto 20px;
}

/* ---------- Value Box (About) ---------- */
.value-box {
    background: #fff;
    text-align: center;
    padding: 35px 20px;
    border-radius: 16px;
    transition: .35s;
    box-shadow: var(--shadow);
}
.value-box:hover {
    background: var(--blue);
    color: #fff;
}
.value-box i {
    font-size: 36px;
    margin-bottom: 18px;
}

/* ---------- Facility Card (About) ---------- */
.facility-card {
    background: #fff;
    padding: 35px;
    border-radius: 18px;
    transition: .35s;
    box-shadow: var(--shadow);
}
.facility-card:hover {
    transform: translateY(-10px);
}
.facility-card i {
    font-size: 42px;
    color: var(--blue);
    margin-bottom: 20px;
}

/* ---------- Leader Card (About) ---------- */
.leader-card {
    background: #fff;
    border-radius: 20px;
    overflow: hidden;
    transition: .35s;
}
.leader-card img {
    width: 100%;
    height: 380px;
    object-fit: cover;
}
.leader-card:hover {
    transform: translateY(-8px);
}
.leader-content {
    padding: 30px;
}

/* ---------- Achievement Card (About) ---------- */
.achievement-card {
    background: #fff;
    border-radius: 18px;
    padding: 35px;
    box-shadow: var(--shadow);
    transition: .35s;
}
.achievement-card:hover {
    transform: translateY(-10px);
}
.achievement-card i {
    font-size: 48px;
    color: var(--secondary);
    margin-bottom: 20px;
}

/* ---------- Home Hero ---------- */
.hero-section {
    position: relative;
    min-height: 90vh; /* 100vh থেকে কমিয়ে ওভারল্যাপ ঠিক করা */
    display: flex;
    align-items: center;
    overflow: hidden;
    color: #fff;
    background: 
        linear-gradient(rgba(0,35,80,.75), rgba(0,35,80,.75)),
        url("../assets/images/RGC Campus.jpg") 
        center center/cover no-repeat;
    padding-bottom: 40px;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(255,193,7,.18), transparent 45%);
}
.hero-title {
    font-size: 3.8rem;
    font-weight: 800;
    line-height: 1.2;
}
.hero-title span {
    display: block;
    color: var(--secondary);
}
.hero-text {
    font-size: 1.15rem;
    max-width: 650px;
    line-height: 1.9;
    opacity: .95;
}
.hero-badge {
    display: inline-block;
    padding: 10px 22px;
    border-radius: 40px;
    background: rgba(255,255,255,.12);
    backdrop-filter: blur(8px);
    font-weight: 600;
}
.hero-badge i {
    color: var(--secondary);
    margin-right: 8px;
}
.hero-card {
    background: rgba(255,255,255,.12);
    backdrop-filter: blur(14px);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    border: 1px solid rgba(255,255,255,.2);
    box-shadow: 0 20px 50px rgba(0,0,0,.25);
}
.hero-logo {
    width: 100px;
    margin-bottom: 20px;
}
.hero-card h3 {
    font-weight: 700;
}
.hero-card p {
    opacity: .9;
}
.hero-info {
    text-align: left;
}
.hero-info div {
    margin-bottom: 15px;
}
.hero-info i {
    width: 25px;
    color: var(--secondary);
}
.scroll-down {
    position: absolute;
    left: 50%;
    bottom: 30px;
    transform: translateX(-50%);
}
.scroll-down a {
    color: #fff;
    font-size: 28px;
    animation: bounce 2s infinite;
}
@keyframes bounce {
    0%,20%,50%,80%,100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* ---------- Home Stats (overlap hero) ---------- */
.hero-stats {
    margin-top: -80px; /* বেশি টান দিয়ে ওভারল্যাপ করানো */
    position: relative;
    z-index: 20;
    padding-bottom: 30px;
}

/* ---------- Head Message (Home) ---------- */
.head-message {
    background: #ffffff;
}
.head-image img {
    width: 100%;
    border-radius: 24px;
    box-shadow: 0 20px 45px rgba(0,0,0,.12);
}
.head-social {
    display: flex;
    justify-content: center;
    gap: 15px;
}
.head-social a {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: .35s;
}
.head-social a:hover {
    background: var(--secondary);
    color: var(--primary);
    transform: translateY(-6px);
}
.head-card {
    background: #fff;
    border-radius: 24px;
    padding: 45px;
    box-shadow: 0 18px 45px rgba(0,0,0,.08);
    position: relative;
}
.quote-icon {
    position: absolute;
    right: 35px;
    top: 30px;
    font-size: 60px;
    color: #e9eef7;
}
.signature {
    border-left: 5px solid var(--primary);
    padding-left: 20px;
}
.signature h5 {
    color: var(--primary);
    font-weight: 700;
}

/* ---------- Notice (Home) ---------- */
.notice-card {
    display: flex;
    align-items: center;
    background: #fff;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: .35s;
}
.notice-card:hover {
    transform: translateY(-6px);
}
.notice-date {
    min-width: 95px;
    background: var(--primary);
    color: #fff;
    text-align: center;
    padding: 22px 10px;
}
.notice-date h5 {
    margin: 0;
}
.notice-content {
    padding: 25px;
}
.notice-content h5 {
    color: var(--primary);
    margin-bottom: 10px;
}
.notice-content a {
    text-decoration: none;
    font-weight: 600;
}

/* ---------- Event (Home) ---------- */
.event-box {
    background: #fff;
    border-radius: var(--radius);
    padding: 35px;
    height: 100%;
    box-shadow: var(--shadow);
}
.event-box h3 {
    color: var(--primary);
    font-weight: 700;
}
.event-item {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 25px;
}
.event-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

/* ---------- Quick Links (Home) ---------- */
.quick-card {
    display: block;
    background: #fff;
    border-radius: var(--radius);
    padding: 40px 25px;
    text-align: center;
    color: var(--primary);
    transition: .35s;
    box-shadow: var(--shadow);
    text-decoration: none;
}
.quick-card:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-10px);
}
.quick-card i {
    font-size: 42px;
    margin-bottom: 20px;
}

/* ---------- Gallery (Home) ---------- */
.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 20px;
}
.gallery-item img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    transition: .5s;
}
.gallery-item:hover img {
    transform: scale(1.08);
}
.gallery-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,51,102,.55);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: .35s;
}
.gallery-item:hover .gallery-overlay {
    opacity: 1;
}
.gallery-overlay i {
    color: #fff;
    font-size: 40px;
}

/* ---------- Testimonial (Home) ---------- */
.testimonial-card {
    max-width: 850px;
    margin: auto;
    background: #fff;
    padding: 45px;
    border-radius: 24px;
    text-align: center;
    box-shadow: 0 15px 40px rgba(0,0,0,.08);
}
.testimonial-card img {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    object-fit: cover;
    margin: 25px auto 15px;
}
.testimonial-card .quote-icon {
    position: static;
    color: var(--secondary);
    font-size: 42px;
    margin-bottom: 20px;
}

/* ---------- Resources Page ---------- */
.resource-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 35px 30px;
    box-shadow: var(--shadow);
    transition: .35s;
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid rgba(0,0,0,.05);
}
.resource-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 18px 45px rgba(0,0,0,.15);
}
.resource-icon {
    width: 75px;
    height: 75px;
    border-radius: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-size: 30px;
    margin-bottom: 25px;
}
.resource-card h4 {
    font-weight: 700;
    margin-bottom: 15px;
}
.resource-card p {
    color: #6c757d;
    line-height: 1.7;
}
.resource-list {
    list-style: none;
    padding: 0;
    margin: 20px 0 30px;
}
.resource-list li {
    margin-bottom: 12px;
    color: #495057;
    font-size: .95rem;
}
.resource-list i {
    color: #198754;
    margin-right: 8px;
}
.resource-card .btn {
    font-weight: 600;
    letter-spacing: .3px;
}

/* ---------- Map (Contact) ---------- */
.map-card {
    border-radius: 20px;
    overflow: hidden;
    background: #fff;
    box-shadow: var(--shadow);
}
.map-card iframe {
    display: block;
    width: 100%;
    height: 420px;
    border: 0;
}

/* ---------- Useful Links (Contact) ---------- */
.link-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 35px 25px;
    text-align: center;
    height: 100%;
    transition: .35s;
    box-shadow: var(--shadow);
}
.link-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 18px 45px rgba(0,0,0,.12);
}
.link-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: auto auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    font-size: 32px;
}
.link-icon.facebook {
    background: #1877F2;
}
.link-icon.wikipedia {
    background: #444;
}
.link-card h4 {
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 15px;
}
.link-card p {
    color: #666;
    margin-bottom: 22px;
}

/* ---------- Footer ---------- */
.footer {
    background: #001f3f;
    color: #fff;
    padding: 70px 0 20px;
}
.footer h4,
.footer h5 {
    color: #fff;
    margin-bottom: 20px;
    font-weight: 700;
}
.footer p {
    color: #d8d8d8;
    line-height: 1.8;
}
.footer hr {
    border-color: rgba(255,255,255,.15);
    margin: 35px 0 20px;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-links li {
    margin-bottom: 12px;
}
.footer-links a {
    color: #dcdcdc;
    text-decoration: none;
    transition: .3s;
}
.footer-links a:hover {
    color: var(--secondary);
    padding-left: 8px;
}
.social-links {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}
.social-links a {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255,255,255,.08);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: .35s;
}
.social-links a:hover {
    background: var(--secondary);
    color: var(--primary);
    transform: translateY(-6px);
}

/* ---------- Back to Top ---------- */
#topBtn {
    position: fixed;
    right: 25px;
    bottom: 25px;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    display: none;
    z-index: 999;
    box-shadow: 0 8px 20px rgba(0,0,0,.25);
}

/* ---------- Responsive ---------- */
@media (max-width: 991px) {
    .about-hero h1,
    .contact-hero h1 {
        font-size: 2.6rem;
    }
    .hero-title {
        font-size: 2.8rem;
    }
    .hero-card {
        margin-top: 40px;
    }
    .head-card {
        margin-top: 30px;
    }
    .staff-photo {
        min-height: 260px;
    }
    .info-box .section-title {
        text-align: center;
    }
    .contact-cta {
        text-align: center;
    }
    .contact-cta .text-lg-end {
        margin-top: 25px;
        text-align: center !important;
    }
}

@media (max-width: 768px) {
    .top-header {
        display: none;
    }
    .navbar-brand h5 {
        font-size: 17px;
    }
    .navbar-brand small {
        font-size: 12px;
    }
    .about-hero,
    .contact-hero {
        min-height: 280px;
    }
    .about-hero h1,
    .contact-hero h1 {
        font-size: 2rem;
    }
    .about-hero p,
    .contact-hero p {
        font-size: 1rem;
    }
    .hero-section {
        min-height: 80vh;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .hero-text {
        font-size: 1rem;
    }
    .section-title {
        font-size: 28px;
    }
    .hero-stats {
        margin-top: -30px; /* মোবাইলে কম ওভারল্যাপ */
    }
    .notice-card {
        flex-direction: column;
        text-align: center;
    }
    .notice-date {
        width: 100%;
    }
    .event-item {
        flex-direction: column;
        text-align: center;
    }
    .head-card {
        padding: 30px;
    }
    .testimonial-card {
        padding: 30px 20px;
    }
    .contact-box {
        padding: 28px 20px;
    }
    .link-card {
        padding: 30px 20px;
    }
    .footer {
        text-align: center;
    }
    .social-links {
        justify-content: center;
    }
    .footer-links {
        margin-bottom: 30px;
    }
    .history-card,
    .feature-card,
    .facility-card,
    .achievement-card {
        padding: 25px;
    }
}