/* ===== রুট ভেরিয়েবল ===== */
:root {
    --primary: #0d2c4f;
    --primary-light: #1f3e61;
    --secondary: #f47321;
    --secondary-light: #ff8c42;
    --black: #0b1a2b;
    --dark-gray: #2e3b4e;
    --gray: #54657e;
    --light-gray: #8b9ab0;
    --border-gray: #e1e7ef;
    --bg-gray: #f6f8fc;
    --white: #ffffff;
    --shadow-sm: 0 5px 20px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 40px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hind Siliguri', sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
}

/* আপনার ইমেজের জন্য এই CSS যোগ করুন */
.about-img {
    width: 100%;
    height: 450px;
    object-fit: cover;
    image-rendering: -webkit-optimize-contrast;  /* WebKit ব্রাউজারের জন্য */
    image-rendering: crisp-edges;                 /* ফায়ারফক্সের জন্য */
    image-rendering: pixelated;                    /* ক্রোমের জন্য */
    -ms-interpolation-mode: bicubic;               /* IE এর জন্য */
    transform: translateZ(0);                      /* হার্ডওয়্যার এক্সিলারেশন */
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

/* মোবাইলের জন্য আলাদা স্টাইল */
@media (max-width: 768px) {
    .about-img {
        height: 250px;
        image-rendering: auto;  /* মোবাইলে স্বাভাবিক রাখুন */
    }
}

/* ===== টাইপোগ্রাফি ===== */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--black);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; margin-bottom: 1.5rem; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }

p { color: var(--gray); margin-bottom: 1rem; }

/* ===== লে-আউট ===== */
.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 5%;
}

section {
    padding: 4rem 5%;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    position: relative;
    display: inline-block;
    padding-bottom: 0.5rem;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--secondary);
}

.section-subtitle {
    color: var(--light-gray);
    font-size: 1.2rem;
    max-width: 700px;
    margin: 1rem auto 0;
}

/* ===== নেভিগেশন ===== */
.navbar {
    background: var(--white);
    border-bottom: 1px solid var(--border-gray);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark-gray);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--secondary);
    border-bottom-color: var(--secondary);
}

.mobile-menu-btn {
    display: none;
    font-size: 1.8rem;
    color: var(--primary);
    cursor: pointer;
}

/* ===== হিরো সেকশন ===== */
.hero {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    text-align: center;
    padding: 5rem 5%;
}

.hero h1 {
    color: white;
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hero p {
    color: rgba(255,255,255,0.9);
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 2rem;
}

/* ===== পেজ হিরো ===== */
.page-hero {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    text-align: center;
    padding: 3rem 5%;
}

.page-hero h1 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.page-hero p {
    color: rgba(255,255,255,0.8);
}

.page-hero a {
    color: white;
}

/* ===== বাটন ===== */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--secondary);
    color: white;
}

.btn-primary:hover {
    background: var(--secondary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    border: 2px solid var(--border-gray);
    background: transparent;
    color: var(--dark-gray);
}

.btn-outline:hover {
    border-color: var(--secondary);
    color: var(--secondary);
}

/* ===== গ্রিড ===== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

/* ===== কার্ড ===== */
.card {
    background: var(--white);
    border: 1px solid var(--border-gray);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--secondary);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--bg-gray);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon i {
    font-size: 1.8rem;
    color: var(--secondary);
}

/* ===== নিউজ কার্ড ===== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 2rem 0;
}

.news-card {
    background: var(--white);
    border: 1px solid var(--border-gray);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.news-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--secondary);
}

.news-content {
    padding: 1.5rem;
}

.news-date {
    color: var(--light-gray);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.news-content h3 {
    margin-bottom: 1rem;
}

.news-content h3 a {
    color: var(--black);
    text-decoration: none;
}

.news-content h3 a:hover {
    color: var(--secondary);
}

.read-more {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.read-more:hover {
    gap: 10px;
}

/* ===== নোটিশ লিস্ট ===== */
.notice-list {
    background: var(--white);
    border: 1px solid var(--border-gray);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.notice-item {
    display: flex;
    align-items: center;
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--border-gray);
    transition: var(--transition);
}

.notice-item:hover {
    background: var(--bg-gray);
}

.notice-item:last-child {
    border-bottom: none;
}

.notice-date {
    min-width: 100px;
    color: var(--secondary);
    font-weight: 600;
    font-size: 0.9rem;
}

.notice-title {
    flex: 1;
    margin: 0 1rem;
}

.notice-title a {
    color: var(--dark-gray);
    text-decoration: none;
}

.notice-title a:hover {
    color: var(--secondary);
}

/* ===== গ্যালারি ===== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 3rem 0;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    height: 250px;
    cursor: pointer;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(11,43,79,0.9));
    color: white;
    padding: 1.5rem;
    transform: translateY(100%);
    transition: transform 0.3s;
}

.gallery-item:hover .gallery-overlay {
    transform: translateY(0);
}

/* ===== শিক্ষক কার্ড ===== */
.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.teacher-card {
    background: var(--white);
    border: 1px solid var(--border-gray);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.teacher-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--secondary);
    transform: translateY(-5px);
}

.teacher-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.teacher-info {
    padding: 1.5rem;
    text-align: center;
}

.teacher-info h3 {
    color: var(--black);
    margin-bottom: 0.5rem;
}

.teacher-info p {
    color: var(--gray);
    margin-bottom: 0.5rem;
}

.teacher-subject {
    background: var(--bg-gray);
    padding: 0.3rem 1rem;
    border-radius: var(--radius-full);
    display: inline-block;
    color: var(--secondary);
    font-weight: 600;
    font-size: 0.9rem;
}

/* ===== রেজাল্ট সার্চ ===== */
.result-search {
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    padding: 3rem;
    text-align: center;
    margin: 2rem 0;
}

.search-form {
    max-width: 600px;
    margin: 2rem auto 0;
    display: flex;
    gap: 1rem;
}

.search-form select,
.search-form input {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--border-gray);
    border-radius: var(--radius-md);
    font-size: 1rem;
}

.search-form button {
    padding: 1rem 2rem;
    background: var(--secondary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
}

/* ===== যোগাযোগ ফর্ম ===== */
.contact-form {
    background: var(--white);
    border: 1px solid var(--border-gray);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-gray);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--secondary);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.info-item i {
    width: 40px;
    height: 40px;
    background: var(--bg-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary);
}

/* ===== ব্যাজ ===== */
.badge {
    display: inline-block;
    padding: 0.2rem 0.8rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--bg-gray);
    color: var(--gray);
}

.badge-new {
    background: var(--secondary);
    color: white;
}

/* ===== ফুটার ===== */
.footer {
    background: var(--black);
    color: white;
    padding: 4rem 5% 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1300px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
}

.footer-section h3 {
    color: var(--secondary);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.footer-section p,
.footer-section a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    margin-bottom: 0.8rem;
    display: block;
}

.footer-section a:hover {
    color: var(--secondary);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.8rem;
}

.footer-bottom {
    max-width: 1300px;
    margin: 3rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    color: rgba(255,255,255,0.5);
}

/* ===== ইউটিলিটি ===== */
.text-center { text-align: center; }
.mt-3 { margin-top: 3rem; }
.mb-3 { margin-bottom: 3rem; }

/* ===== রেসপন্সিভ ===== */
@media (max-width: 1200px) {
    .grid-4 { grid-template-columns: repeat(3, 1fr); }
    .footer-content { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 992px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .news-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 1rem;
        gap: 0.5rem;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--border-gray);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .search-form {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}