/* ==========================================================
   OKGS Website — মূল স্টাইলশিট
   সিম্পল, প্রফেশনাল, মোবাইল-ফ্রেন্ডলি ডিজাইন
   ========================================================== */

:root {
    /* রঙের প্যালেট: গাঢ় সবুজ (মূল), সোনালি (এক্সেন্ট), হালকা পটভূমি */
    --green-900: #14532d;
    --green-800: #166534;
    --green-700: #15803d;
    --green-50:  #f0fdf4;
    --gold-500:  #d97706;
    --gold-100:  #fef3c7;
    --ink-900:   #1c1917;
    --ink-600:   #57534e;
    --paper:     #ffffff;
    --paper-alt: #fafaf9;
    --line:      #e7e5e4;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: "Hind Siliguri", "Noto Sans Bengali", sans-serif;
    color: var(--ink-900);
    background: var(--paper);
    line-height: 1.7;
}

img { max-width: 100%; display: block; }

a { color: var(--green-700); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* ---------- হেডার ও নেভিগেশন ---------- */

.topbar {
    background: var(--green-900);
    color: #d1fae5;
    font-size: .88rem;
    padding: 6px 0;
}
.topbar .container {
    display: flex; flex-wrap: wrap; gap: 6px 24px;
    justify-content: space-between; align-items: center;
}
.topbar a { color: #d1fae5; }

.site-header {
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    position: sticky; top: 0; z-index: 50;
    box-shadow: 0 1px 2px rgba(0,0,0,.04);
}
.site-header .container {
    display: flex; align-items: center; justify-content: space-between;
    padding-top: 10px; padding-bottom: 10px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { width: 52px; height: 52px; object-fit: contain; }
.brand .name { font-weight: 700; font-size: 1.05rem; color: var(--green-900); line-height: 1.3; }
.brand .sub { font-size: .78rem; color: var(--ink-600); }

nav.main-nav ul { list-style: none; display: flex; gap: 4px; }
nav.main-nav a {
    display: block; padding: 8px 14px; border-radius: 8px;
    color: var(--ink-900); font-weight: 500;
}
nav.main-nav a:hover { background: var(--green-50); text-decoration: none; color: var(--green-800); }
nav.main-nav a.active { background: var(--green-800); color: #fff; }

/* মোবাইল মেনু বোতাম */
.menu-toggle {
    display: none; background: none; border: 1px solid var(--line);
    border-radius: 8px; padding: 8px 12px; font-size: 1.2rem; cursor: pointer;
    color: var(--green-900);
}

@media (max-width: 860px) {
    .menu-toggle { display: block; }
    nav.main-nav {
        display: none; position: absolute; top: 100%; left: 0; right: 0;
        background: var(--paper); border-bottom: 1px solid var(--line);
        box-shadow: var(--shadow);
    }
    nav.main-nav.open { display: block; }
    nav.main-nav ul { flex-direction: column; padding: 10px 20px; }
}

/* ---------- হিরো (হোমপেজ) ---------- */

.hero {
    position: relative; color: #fff;
    background: linear-gradient(rgba(15,50,30,.72), rgba(15,50,30,.72)),
                url("../images/hero-building.jpg") center/cover no-repeat;
    padding: 90px 0;
    text-align: center;
}
.hero h1 { font-size: clamp(1.7rem, 4.5vw, 2.8rem); margin-bottom: 10px; }
.hero p.tagline { font-size: clamp(1rem, 2.2vw, 1.25rem); color: #d1fae5; max-width: 720px; margin: 0 auto 28px; }

.btn {
    display: inline-block; padding: 11px 26px; border-radius: 999px;
    font-weight: 600; margin: 4px 6px;
}
.btn-primary { background: var(--gold-500); color: #fff; }
.btn-primary:hover { background: #b45309; text-decoration: none; }
.btn-ghost { border: 2px solid #fff; color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.15); text-decoration: none; }

/* ভেতরের পেজের ছোট ব্যানার */
.page-banner {
    background: linear-gradient(rgba(15,50,30,.78), rgba(15,50,30,.78)),
                url("../images/hero-assembly.jpg") center/cover no-repeat;
    color: #fff; text-align: center; padding: 48px 0;
}
.page-banner h1 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }

/* ---------- সাধারণ সেকশন ---------- */

section { padding: 56px 0; }
section.alt { background: var(--paper-alt); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 36px; }
.section-head h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); color: var(--green-900); }
.section-head p { color: var(--ink-600); margin-top: 6px; }
.section-head .rule {
    width: 64px; height: 4px; background: var(--gold-500);
    border-radius: 2px; margin: 14px auto 0;
}

h3.block-title { color: var(--green-900); font-size: 1.25rem; margin: 28px 0 10px; }

/* ---------- কার্ড গ্রিড ---------- */

.grid { display: grid; gap: 20px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 860px) {
    .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
    .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
}

.card {
    background: var(--paper); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.card .icon { font-size: 1.8rem; margin-bottom: 8px; }
.card h3 { color: var(--green-900); font-size: 1.05rem; margin-bottom: 6px; }
.card p { color: var(--ink-600); font-size: .95rem; }

/* ---------- পরিসংখ্যান ---------- */

.stats { background: var(--green-900); color: #fff; }
.stats .grid { text-align: center; }
.stats .num { font-size: 2.2rem; font-weight: 700; color: var(--gold-100); }
.stats .label { color: #d1fae5; }

/* ---------- ছবি + লেখা (পাশাপাশি) ---------- */

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
.split img { border-radius: var(--radius); box-shadow: var(--shadow); }
.split h2 { color: var(--green-900); margin-bottom: 12px; font-size: 1.6rem; }
.split p { margin-bottom: 12px; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }

/* ---------- শিক্ষক কার্ড ---------- */

.person { text-align: center; }
.person img {
    width: 100%; aspect-ratio: 1/1.1; object-fit: cover; object-position: top;
    border-radius: var(--radius); box-shadow: var(--shadow);
}
.person h3 { margin-top: 12px; font-size: 1rem; color: var(--green-900); }
.person p { color: var(--ink-600); font-size: .9rem; }

/* ---------- গ্যালারি ---------- */

.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.gallery-grid img {
    width: 100%; aspect-ratio: 4/3; object-fit: cover;
    border-radius: var(--radius); box-shadow: var(--shadow);
    transition: transform .2s ease;
}
.gallery-grid a:hover img { transform: scale(1.02); }
@media (max-width: 860px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .gallery-grid { grid-template-columns: 1fr; } }

/* ---------- ক্লাব ---------- */

.club { display: grid; grid-template-columns: 140px 1fr; gap: 24px; align-items: start; }
.club img.club-logo { width: 140px; height: 140px; object-fit: contain; }
.club ol { padding-left: 22px; }
.club ol li { margin-bottom: 4px; }
@media (max-width: 640px) {
    .club { grid-template-columns: 1fr; }
    .club img.club-logo { margin: 0 auto; }
}

/* ---------- টেবিল (ফলাফল) ---------- */

.table-wrap { overflow-x: auto; }
table.results {
    width: 100%; border-collapse: collapse; font-size: .95rem;
    background: var(--paper); box-shadow: var(--shadow); border-radius: var(--radius);
}
table.results th, table.results td {
    border: 1px solid var(--line); padding: 8px 12px; text-align: center;
}
table.results th { background: var(--green-800); color: #fff; font-weight: 600; }
table.results tr:nth-child(even) td { background: var(--green-50); }

/* ---------- তালিকা (বৈশিষ্ট্য) ---------- */

ul.feature-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 8px 28px; }
ul.feature-list li { padding-left: 26px; position: relative; }
ul.feature-list li::before {
    content: "✔"; position: absolute; left: 0; color: var(--green-700); font-weight: 700;
}
@media (max-width: 720px) { ul.feature-list { grid-template-columns: 1fr; } }

/* ---------- উক্তি ---------- */

blockquote.quote {
    background: var(--green-50); border-right: none;
    border-left: 4px solid var(--gold-500);
    padding: 18px 22px; border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 1.05rem;
}
blockquote.quote footer { color: var(--ink-600); font-size: .9rem; margin-top: 8px; }

/* ---------- যোগাযোগ ---------- */

.contact-item { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 18px; }
.contact-item .ci-icon {
    width: 44px; height: 44px; flex: none; border-radius: 50%;
    background: var(--green-50); color: var(--green-800);
    display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
}
.contact-item h3 { font-size: 1rem; color: var(--green-900); }
.contact-item p, .contact-item a { color: var(--ink-600); }

/* ---------- নোটিশ বক্স ---------- */

.notice {
    background: var(--gold-100); border: 1px solid #fcd34d;
    border-radius: var(--radius); padding: 18px 22px; margin: 20px 0;
}

/* ---------- ফুটার ---------- */

footer.site-footer { background: var(--green-900); color: #d1fae5; padding: 48px 0 0; }
footer.site-footer h3 { color: #fff; margin-bottom: 12px; font-size: 1.05rem; }
footer.site-footer a { color: #d1fae5; }
footer.site-footer .grid { gap: 32px; }
footer.site-footer ul { list-style: none; }
footer.site-footer li { margin-bottom: 6px; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.15);
    margin-top: 36px; padding: 16px 0; font-size: .88rem;
    text-align: center; color: #a7f3d0;
}
.socials { display: flex; gap: 10px; margin-top: 10px; }
.socials a {
    width: 38px; height: 38px; border-radius: 50%;
    background: rgba(255,255,255,.12); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: .85rem;
}
.socials a:hover { background: var(--gold-500); text-decoration: none; }