/* ============================================================
   C.E.G. ENGINEERING — Theme derived from company logo
   Blue (trust/industry) · Green (gas/energy) · Yellow (caution/gear)
   Red (flame accent)
   ============================================================ */
:root {
    --ceg-blue: #1039c4;
    --ceg-blue-dark: #0a2690;
    --ceg-green: #00a651;
    --ceg-green-dark: #00803e;
    --ceg-yellow: #ffd200;
    --ceg-red: #ed1c24;
    --dark: #10141f;
    --gray-700: #4a5568;
    --gray-400: #a0aec0;
    --gray-100: #f5f7fb;
    --white: #ffffff;
    --radius: 14px;
    --shadow: 0 10px 30px rgba(16, 57, 196, 0.10);
    --transition: all .3s cubic-bezier(.4,0,.2,1);
}

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

body {
    font-family: 'Segoe UI', 'Sarabun', Tahoma, sans-serif;
    color: var(--dark);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 30px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}
.btn-primary {
    background: linear-gradient(135deg, var(--ceg-blue), var(--ceg-blue-dark));
    color: #fff;
    box-shadow: 0 8px 20px rgba(16,57,196,.35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 26px rgba(16,57,196,.45); }
.btn-outline {
    background: transparent;
    border: 2px solid var(--ceg-green);
    color: var(--ceg-green-dark);
}
.btn-outline:hover { background: var(--ceg-green); color: #fff; transform: translateY(-3px); }
.btn-accent {
    background: linear-gradient(135deg, var(--ceg-yellow), #ffb700);
    color: var(--dark);
}
.btn-accent:hover { transform: translateY(-3px); }

/* ---------- Navbar ---------- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 999;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,.06);
    transition: var(--transition);
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}
.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 18px;
    color: var(--ceg-blue-dark);
}
.navbar-brand img { height: 46px; width: 46px; object-fit: contain; }
.navbar-brand span small { display: block; font-weight: 500; font-size: 11px; color: var(--gray-700); letter-spacing: .5px; }

.nav-links { display: flex; gap: 8px; align-items: center; }
.nav-links a {
    padding: 10px 18px;
    font-weight: 600;
    font-size: 15px;
    color: var(--dark);
    border-radius: 50px;
    transition: var(--transition);
    position: relative;
}
.nav-links a:hover, .nav-links a.active { background: var(--gray-100); color: var(--ceg-blue-dark); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; }
.nav-toggle span { width: 26px; height: 3px; background: var(--ceg-blue-dark); border-radius: 3px; transition: var(--transition); }

@media (max-width: 900px) {
    .nav-toggle { display: flex; }
    .nav-links {
        position: absolute;
        top: 76px; left: 0; right: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        padding: 12px;
        box-shadow: 0 12px 20px rgba(0,0,0,.08);
        display: none;
    }
    .nav-links.open { display: flex; }
    .nav-links a { text-align: center; padding: 14px; }
}

/* ---------- Hero / Banner ---------- */
.hero {
    position: relative;
    min-height: 92vh;
    display: flex;
    align-items: center;
    color: #fff;
    overflow: hidden;
    background: linear-gradient(120deg, var(--ceg-blue-dark) 0%, var(--ceg-blue) 55%, var(--ceg-green-dark) 100%);
}
.hero::before {
    content: '';
    position: absolute; inset: 0;
    background: url('../images/banner.jpg') center/cover no-repeat;
    opacity: .28;
    z-index: 0;
}
.hero::after {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(circle at 20% 30%, rgba(255,210,0,.18), transparent 45%),
                radial-gradient(circle at 85% 75%, rgba(237,28,36,.18), transparent 45%);
    z-index: 0;
}
.hero-content { position: relative; z-index: 1; max-width: 720px; padding-top: 76px; }
.hero-tag {
    display: inline-block;
    padding: 7px 18px;
    background: rgba(255,210,0,.18);
    border: 1px solid var(--ceg-yellow);
    color: var(--ceg-yellow);
    border-radius: 50px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 22px;
    animation: fadeUp .8s ease both;
}
.hero h1 {
    font-size: clamp(34px, 5.2vw, 58px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    animation: fadeUp .8s ease .1s both;
}
.hero h1 span { color: var(--ceg-yellow); }
.hero p { font-size: 18px; color: rgba(255,255,255,.85); margin-bottom: 34px; animation: fadeUp .8s ease .2s both; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; animation: fadeUp .8s ease .3s both; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(24px);} to { opacity: 1; transform: translateY(0);} }

.hero-scroll {
    position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
    z-index: 1; color: #fff; font-size: 13px; text-align: center; opacity: .8;
    animation: bounce 2s infinite;
}
@keyframes bounce { 0%,100%{transform: translate(-50%,0);} 50%{transform: translate(-50%,8px);} }

/* ---------- Sections ---------- */
.section { padding: 100px 0; }
.section-alt { background: var(--gray-100); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 56px; }
.section-tag {
    display: inline-block; color: var(--ceg-green-dark); font-weight: 700;
    letter-spacing: 2px; font-size: 13px; text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; margin-bottom: 14px; }
.section-head p { color: var(--gray-700); }

.reveal { opacity: 0; transform: translateY(30px); transition: all .7s cubic-bezier(.4,0,.2,1); }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- About / Introduction ---------- */
.about-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: center; }
.about-media { position: relative; }
.about-media img { border-radius: var(--radius); box-shadow: var(--shadow); }
.about-media::before {
    content: '';
    position: absolute; top: -18px; left: -18px; width: 120px; height: 120px;
    background: var(--ceg-yellow); border-radius: 50%; z-index: -1; opacity: .5;
}
.about-list { margin-top: 20px; display: grid; gap: 16px; }
.about-list li { display: flex; gap: 14px; align-items: flex-start; }
.about-list .dot {
    flex-shrink: 0; width: 34px; height: 34px; border-radius: 10px;
    background: linear-gradient(135deg, var(--ceg-green), var(--ceg-green-dark));
    color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800;
}
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; } }

/* ---------- Cards (Projects / Certificates) ---------- */
.grid-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
@media (max-width: 960px) { .grid-cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-cards { grid-template-columns: 1fr; } }

.card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 6px 18px rgba(16,20,31,.07);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.card:hover { transform: translateY(-8px); box-shadow: 0 18px 34px rgba(16,57,196,.16); }
.card-img { height: 200px; overflow: hidden; background: var(--gray-100); }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.card:hover .card-img img { transform: scale(1.08); }
.card-body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.card-body h3 { font-size: 18px; margin-bottom: 10px; }
.card-body p { color: var(--gray-700); font-size: 14px; flex: 1; }
.card-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 16px; font-size: 13px; color: var(--gray-400); }
.card-link { margin-top: 14px; font-weight: 700; color: var(--ceg-blue-dark); display: inline-flex; align-items: center; gap: 6px; }
.card-link:hover { color: var(--ceg-green-dark); }

.section-footer-btn { text-align: center; margin-top: 46px; }

/* ---------- Search / filter bar ---------- */
.toolbar {
    display: flex; gap: 14px; margin-bottom: 40px; flex-wrap: wrap; align-items: center; justify-content: space-between;
}
.search-box { position: relative; flex: 1; min-width: 240px; max-width: 420px; }
.search-box input {
    width: 100%; padding: 13px 20px 13px 44px; border-radius: 50px; border: 2px solid #e6e9f2;
    font-size: 15px; transition: var(--transition);
}
.search-box input:focus { outline: none; border-color: var(--ceg-blue); }
.search-box svg { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--gray-400); }

/* ---------- Detail pages ---------- */
.detail-hero { padding: 150px 0 40px; background: var(--gray-100); }
.detail-hero h1 { font-size: clamp(26px, 3.6vw, 40px); font-weight: 800; margin-bottom: 14px; }
.detail-meta { display: flex; gap: 20px; color: var(--gray-700); font-size: 14px; flex-wrap: wrap; }
.detail-meta span { display: flex; align-items: center; gap: 6px; }
.detail-body { padding: 60px 0; }
.detail-cover { border-radius: var(--radius); overflow: hidden; margin-bottom: 36px; box-shadow: var(--shadow); }
.detail-text { color: var(--gray-700); font-size: 16px; max-width: 820px; margin-bottom: 40px; white-space: pre-line; }
.file-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }
.file-item {
    display: flex; flex-direction: column; border: 1px solid #e6e9f2; border-radius: 12px; overflow: hidden;
    transition: var(--transition); background: #fff;
}
.file-item:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.file-item img { height: 150px; object-fit: cover; width: 100%; }
.file-item .file-icon { height: 150px; display: flex; align-items: center; justify-content: center; background: var(--gray-100); font-size: 40px; }
.file-item .file-name { padding: 12px 14px; font-size: 13px; font-weight: 600; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.office-card {
    background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}
.office-card .office-head {
    padding: 24px 28px; color: #fff;
    background: linear-gradient(135deg, var(--ceg-blue), var(--ceg-blue-dark));
}
.office-card:nth-child(2) .office-head { background: linear-gradient(135deg, var(--ceg-green), var(--ceg-green-dark)); }
.office-card .office-head h3 { font-size: 20px; font-weight: 800; }
.office-body { padding: 26px 28px; }
.office-body .row { display: flex; gap: 12px; margin-bottom: 14px; font-size: 14.5px; color: var(--gray-700); }
.office-body .row b { min-width: 78px; color: var(--dark); }
.office-map { height: 220px; }
.office-map iframe { width: 100%; height: 100%; border: 0; }

/* ---------- Footer ---------- */
footer { background: var(--dark); color: rgba(255,255,255,.75); padding: 56px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand { display: flex; align-items: center; gap: 12px; color: #fff; font-weight: 800; margin-bottom: 14px; }
.footer-brand img { height: 40px; }
footer h4 { color: #fff; margin-bottom: 16px; font-size: 15px; }
footer ul li { margin-bottom: 10px; font-size: 14px; }
footer ul li a:hover { color: var(--ceg-yellow); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-top: 20px; text-align: center; font-size: 13px; color: rgba(255,255,255,.5); }

/* ---------- Admin ---------- */
.admin-body { background: var(--gray-100); min-height: 100vh; font-family: 'Segoe UI', Tahoma, sans-serif; }
.admin-login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--ceg-blue-dark), var(--ceg-blue), var(--ceg-green-dark)); }
.admin-login-card { background: #fff; padding: 46px; border-radius: var(--radius); box-shadow: 0 24px 60px rgba(0,0,0,.3); width: 380px; max-width: 90vw; }
.admin-login-card img { height: 60px; margin: 0 auto 18px; display: block; }
.admin-login-card h2 { text-align: center; margin-bottom: 6px; }
.admin-login-card p.sub { text-align: center; color: var(--gray-700); font-size: 14px; margin-bottom: 26px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 8px; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 12px 16px; border: 2px solid #e6e9f2; border-radius: 10px; font-size: 14.5px; transition: var(--transition); font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--ceg-blue); }
.password-field { position: relative; }
.password-field .toggle-eye { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); cursor: pointer; color: var(--gray-700); background: none; border: none; font-size: 18px; }
.alert { padding: 13px 18px; border-radius: 10px; margin-bottom: 20px; font-size: 14px; }
.alert-error { background: #fde8e8; color: var(--ceg-red); border: 1px solid #f7b9bb; }
.alert-success { background: #e6f7ee; color: var(--ceg-green-dark); border: 1px solid #a9e6c6; }

.admin-shell { display: flex; min-height: 100vh; }
.admin-sidebar { width: 250px; background: var(--dark); color: #fff; flex-shrink: 0; padding: 26px 18px; }
.admin-sidebar .brand { display: flex; align-items: center; gap: 10px; margin-bottom: 30px; font-weight: 800; }
.admin-sidebar .brand img { height: 36px; }
.admin-sidebar a {
    display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-radius: 10px; margin-bottom: 6px;
    color: rgba(255,255,255,.75); font-size: 14.5px; font-weight: 600; transition: var(--transition);
}
.admin-sidebar a:hover, .admin-sidebar a.active { background: rgba(255,255,255,.1); color: #fff; }
.admin-main { flex: 1; }
.admin-topbar {
    background: #fff; padding: 18px 32px; display: flex; justify-content: space-between; align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,.05); position: relative;
}
.admin-topbar .user-menu { position: relative; }
.admin-topbar .user-btn { display: flex; align-items: center; gap: 10px; cursor: pointer; font-weight: 600; background: none; border: none; font-size: 14.5px; }
.avatar { width: 38px; height: 38px; border-radius: 50%; background: linear-gradient(135deg, var(--ceg-blue), var(--ceg-green)); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; }
.user-dropdown {
    position: absolute; right: 0; top: 54px; background: #fff; box-shadow: var(--shadow); border-radius: 12px;
    width: 200px; padding: 8px; display: none; z-index: 20;
}
.user-dropdown.open { display: block; }
.user-dropdown a { display: block; padding: 11px 14px; border-radius: 8px; font-size: 14px; color: var(--dark); }
.user-dropdown a:hover { background: var(--gray-100); }
.admin-content { padding: 32px; }
.page-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 26px; flex-wrap: wrap; gap: 14px; }
.page-head h1 { font-size: 24px; font-weight: 800; }

.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 30px; }
.stat-card { background: #fff; padding: 24px; border-radius: var(--radius); box-shadow: 0 6px 18px rgba(16,20,31,.06); }
.stat-card .num { font-size: 30px; font-weight: 800; color: var(--ceg-blue-dark); }
.stat-card .label { color: var(--gray-700); font-size: 14px; margin-top: 4px; }

.admin-panel { background: #fff; border-radius: var(--radius); box-shadow: 0 6px 18px rgba(16,20,31,.06); padding: 26px; }
table.admin-table { width: 100%; border-collapse: collapse; }
table.admin-table th, table.admin-table td { text-align: left; padding: 13px 12px; border-bottom: 1px solid #eef0f6; font-size: 14.5px; }
table.admin-table th { color: var(--gray-700); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: .5px; }
table.admin-table img.thumb { width: 54px; height: 54px; object-fit: cover; border-radius: 8px; }
.btn-sm { padding: 8px 16px; font-size: 13px; border-radius: 8px; }
.btn-danger { background: var(--ceg-red); color: #fff; }
.btn-edit { background: var(--ceg-yellow); color: var(--dark); }
.file-upload-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
.file-upload-list .chip { background: var(--gray-100); padding: 6px 12px; border-radius: 20px; font-size: 12.5px; }

/* การ์ดกดได้ทั้งรูปและชื่อเรื่อง */
a.card-img { display: block; }
.card-body h3 a { color: inherit; text-decoration: none; transition: var(--transition); }
.card-body h3 a:hover { color: var(--ceg-blue-dark); }

/* ============================================================
   Lightbox (pop-up ดูรูป)
   ============================================================ */
a.detail-cover { display: block; cursor: zoom-in; }
a.detail-cover img { width: 100%; transition: transform .5s cubic-bezier(.4,0,.2,1); }
a.detail-cover:hover img { transform: scale(1.02); }
a[data-lightbox] { cursor: zoom-in; }
a[data-lightbox] img { transition: var(--transition); }
.file-grid a[data-lightbox]:hover img { opacity: .85; }

html.lb-lock, html.lb-lock body { overflow: hidden; }

.lb {
    position: fixed; inset: 0; z-index: 9999;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden;
    transition: opacity .3s ease, visibility .3s ease;
}
.lb.is-open { opacity: 1; visibility: visible; }
.lb-backdrop {
    position: absolute; inset: 0;
    background: rgba(10, 14, 26, .92);
    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}

.lb-stage {
    position: relative; z-index: 1;
    width: 100%; height: 100%;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 72px 90px 40px; margin: 0;
}
.lb-img {
    max-width: 100%; max-height: calc(100vh - 160px);
    object-fit: contain; border-radius: 10px;
    box-shadow: 0 25px 60px rgba(0,0,0,.5);
    opacity: 0; transform: scale(.94);
    transition: opacity .35s ease, transform .35s cubic-bezier(.2,.8,.2,1);
}
.lb.is-open .lb-img.is-ready { opacity: 1; transform: scale(1); }
.lb-caption {
    margin-top: 16px; color: rgba(255,255,255,.88);
    font-size: 15px; text-align: center; max-width: 720px;
}

.lb-top {
    position: absolute; top: 0; left: 0; right: 0; z-index: 2;
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 20px;
}
.lb-counter { color: rgba(255,255,255,.75); font-size: 14px; letter-spacing: .5px; }

.lb-btn {
    display: inline-flex; align-items: center; justify-content: center;
    width: 46px; height: 46px; border-radius: 50%;
    border: 1px solid rgba(255,255,255,.18);
    background: rgba(255,255,255,.08); color: #fff;
    cursor: pointer; transition: var(--transition);
}
.lb-btn:hover { background: rgba(255,255,255,.2); transform: scale(1.06); }
.lb-btn:focus-visible { outline: 2px solid var(--ceg-yellow); outline-offset: 2px; }
.lb-close:hover { background: var(--ceg-red); border-color: var(--ceg-red); }
.lb-nav { position: absolute; top: 50%; z-index: 2; transform: translateY(-50%); width: 54px; height: 54px; }
.lb-nav:hover { transform: translateY(-50%) scale(1.06); }
.lb-prev { left: 20px; }
.lb-next { right: 20px; }
.lb-nav[hidden] { display: none; }

.lb-spinner {
    position: absolute; top: 50%; left: 50%;
    width: 42px; height: 42px; margin: -21px 0 0 -21px;
    border: 3px solid rgba(255,255,255,.2); border-top-color: #fff;
    border-radius: 50%; animation: lb-spin .8s linear infinite;
    display: none;
}
.lb.is-loading .lb-spinner { display: block; }
@keyframes lb-spin { to { transform: rotate(360deg); } }

@media (max-width: 640px) {
    .lb-stage { padding: 64px 12px 24px; }
    .lb-img { max-height: calc(100vh - 140px); }
    .lb-nav { width: 42px; height: 42px; top: auto; bottom: 18px; transform: none; }
    .lb-nav:hover { transform: none; }
    .lb-prev { left: calc(50% - 54px); }
    .lb-next { right: calc(50% - 54px); }
    .lb-stage { padding-bottom: 80px; }
}