/* ============================================================
   AI Lab | NUS Business School Executive Education
   Shared design system (index + protected subsections)
   Access is enforced by nginx HTTP Basic Auth on the server.
   ============================================================ */

:root {
    --primary-color: #ffffff;
    --accent-color: #00a1e9;
    --accent-glow: rgba(0, 161, 233, 0.6);
    --text-shadow: 0 2px 4px rgba(0,0,0,0.35);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.22);
    --dark-overlay: rgba(0, 0, 0, 0.55);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Montserrat', sans-serif;
    color: var(--primary-color);
    scroll-behavior: smooth;
}

/* Layered background: fixed futuristic lab image + dark overlay */
body {
    min-height: 100vh;
    background-color: #0a1420;
    background-image:
        linear-gradient(var(--dark-overlay), var(--dark-overlay)),
        url('../local_z-image_mtisbqc23js2_0.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* ---------- Navigation ---------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 40px;
    background: rgba(10, 20, 32, 0.55);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-brand {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    letter-spacing: 2px;
    color: var(--primary-color);
    text-decoration: none;
    text-shadow: var(--text-shadow);
}

.nav-links {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 1.5px;
    padding: 8px 14px;
    border: 1px solid transparent;
    border-radius: 20px;
    transition: all 0.25s ease;
    text-transform: uppercase;
}

.nav-links a:hover,
.nav-links a.active {
    color: #fff;
    border-color: var(--accent-color);
    background: rgba(0, 161, 233, 0.18);
    box-shadow: 0 0 12px var(--accent-glow);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 14px 34px;
    border: none;
    border-radius: 26px;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: #fff;
    cursor: pointer;
    background: linear-gradient(135deg, #00a1e9, #0077b6);
    box-shadow: 0 8px 20px rgba(0, 161, 233, 0.35);
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(0, 161, 233, 0.5);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--accent-color);
}

.btn-outline:hover {
    background: rgba(0, 161, 233, 0.18);
}

/* ---------- Hero ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 120px 24px 60px;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    padding: 60px 40px;
    text-align: center;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    max-width: 620px;
    width: 100%;
    animation: fadeInUp 1.2s ease-out forwards;
}

h1 {
    font-family: 'Playfair Display', serif;
    color: var(--primary-color);
    font-size: 4rem;
    margin: 0 0 10px 0;
    letter-spacing: 3px;
    text-shadow: var(--text-shadow);
}

h2 {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 300;
    font-size: 1.4rem;
    letter-spacing: 4px;
    margin-bottom: 30px;
    text-transform: uppercase;
}

.lead {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.1rem;
    line-height: 1.8;
    margin: 20px 0;
    font-weight: 300;
}

.divider {
    height: 3px;
    width: 60px;
    background-color: var(--accent-color);
    margin: 20px auto;
    border-radius: 2px;
    box-shadow: 0 0 10px var(--accent-glow);
}

.hero-actions {
    margin-top: 34px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---------- Subsection cards ---------- */
.sections {
    padding: 40px 24px 80px;
    max-width: 1100px;
    margin: 0 auto;
}

.sections-head {
    text-align: center;
    margin-bottom: 40px;
}

.sections-head h3 {
    font-size: 1.9rem;
    font-weight: 300;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin: 0 0 8px;
}

.sections-head p {
    color: rgba(255,255,255,0.75);
    font-weight: 300;
    margin: 0;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 26px;
}

.subcard {
    background: rgba(255,255,255,0.07);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 22px;
    padding: 34px 28px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    text-decoration: none;
    color: var(--primary-color);
    display: flex;
    flex-direction: column;
}

.subcard:hover {
    transform: translateY(-6px);
    border-color: var(--accent-color);
    box-shadow: 0 18px 40px rgba(0,0,0,0.35), 0 0 22px var(--accent-glow);
}

.subcard .icon {
    font-size: 2rem;
    margin-bottom: 14px;
}

.subcard h4 {
    font-family: 'Playfair Display', serif;
    margin: 0 0 10px;
    font-size: 1.4rem;
    letter-spacing: 1px;
}

.subcard p {
    color: rgba(255,255,255,0.8);
    font-size: 0.95rem;
    font-weight: 300;
    line-height: 1.6;
    margin: 0 0 18px;
    flex: 1;
}

.subcard .lock-tag {
    align-self: flex-start;
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    padding: 4px 10px;
    border-radius: 12px;
}

/* ---------- Restricted badge ---------- */
.restricted-badge {
    display: inline-block;
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    padding: 6px 14px;
    border-radius: 14px;
    margin-top: 16px;
}

/* ---------- Protected content layout ---------- */
.page-wrap {
    padding: 120px 24px 80px;
    max-width: 1100px;
    margin: 0 auto;
}

.page-head {
    text-align: center;
    margin-bottom: 44px;
}

.page-head h1 {
    font-size: 3rem;
}

.page-head p {
    color: rgba(255,255,255,0.8);
    font-weight: 300;
    max-width: 620px;
    margin: 0 auto;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 26px;
}

.content-card {
    background: rgba(255,255,255,0.07);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    padding: 28px 26px;
}

.content-card h4 {
    font-family: 'Playfair Display', serif;
    margin: 0 0 12px;
    font-size: 1.25rem;
}

.content-card ul {
    margin: 0;
    padding-left: 0;
    list-style: none;
}

.content-card li {
    padding: 8px 0;
    color: rgba(255,255,255,0.85);
    font-weight: 300;
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.content-card li:last-child { border-bottom: none; }

.table-wrap { overflow-x: auto; }

.table-wrap table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255,255,255,0.06);
    border-radius: 16px;
    overflow: hidden;
}

.table-wrap th, .table-wrap td {
    padding: 14px 16px;
    text-align: left;
    font-weight: 300;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.table-wrap th {
    color: var(--accent-color);
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-size: 0.78rem;
}

.table-wrap td { color: rgba(255,255,255,0.88); }

.footer-note {
    margin-top: 40px;
    text-align: center;
    color: rgba(255,255,255,0.55);
    font-weight: 300;
    font-size: 0.85rem;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 700px) {
    .nav { padding: 14px 20px; flex-direction: column; gap: 12px; }
    .nav-links { justify-content: center; }
    h1 { font-size: 2.5rem; }
    .page-head h1 { font-size: 2.2rem; }
    h2 { font-size: 1rem; letter-spacing: 2px; }
    .glass-card { padding: 40px 22px; }
    .subcard { padding: 26px 20px; }
}


/* ---------- AI Lab Tool Portals (participants hands-on) ---------- */
.tools-section { padding: 0 0 8px; }

.tools-head { text-align: center; margin-bottom: 34px; }
.tools-head h3 {
    font-size: 1.9rem;
    font-weight: 300;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin: 0 0 10px;
}
.tools-head p {
    color: rgba(255,255,255,0.78);
    font-weight: 300;
    max-width: 760px;
    margin: 0 auto;
    line-height: 1.7;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
    gap: 26px;
}

.tool-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: rgba(255,255,255,0.07);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 22px;
    padding: 30px 28px 26px;
    overflow: hidden;
    text-decoration: none;
    color: var(--primary-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.tool-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--c, var(--accent-color)), transparent);
}
.tool-card:hover {
    transform: translateY(-6px);
    border-color: var(--c, var(--accent-color));
    box-shadow: 0 18px 40px rgba(0,0,0,0.35), 0 0 24px var(--c, var(--accent-glow));
}

.tool-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
}
.tool-card .icon { font-size: 2.2rem; line-height: 1; }

.tool-level {
    font-size: 0.66rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--c, var(--accent-color));
    border: 1px solid var(--c, var(--accent-color));
    padding: 4px 10px;
    border-radius: 12px;
    white-space: nowrap;
    flex-shrink: 0;
}

.tool-card h4 {
    font-family: 'Playfair Display', serif;
    margin: 0 0 6px;
    font-size: 1.5rem;
    letter-spacing: 0.5px;
}
.tool-category {
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.6);
    margin-bottom: 14px;
}
.tool-desc {
    color: rgba(255,255,255,0.85);
    font-size: 0.95rem;
    font-weight: 300;
    line-height: 1.65;
    margin: 0 0 16px;
}

.tool-focus {
    border-top: 1px solid rgba(255,255,255,0.12);
    padding-top: 14px;
    margin: 0 0 18px;
}
.tool-focus .label {
    font-size: 0.7rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--c, var(--accent-color));
    margin-bottom: 6px;
    font-weight: 400;
}
.tool-card .flex-spacer { flex: 1; }

.tool-actions { display: flex; align-items: center; gap: 14px; margin-top: auto; }
.launch-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 22px;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    white-space: nowrap;
    color: #fff;
    background: linear-gradient(135deg, var(--c, #00a1e9), #0077b6);
    box-shadow: 0 8px 20px rgba(0,161,233,0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.tool-card:hover .launch-btn {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(0,161,233,0.5);
}
.tool-url {
    color: rgba(255,255,255,0.45);
    font-size: 0.7rem;
    letter-spacing: 0.3px;
    word-break: break-all;
    line-height: 1.4;
}

.tools-note {
    margin-top: 26px;
    text-align: center;
    color: rgba(255,255,255,0.6);
    font-weight: 300;
    font-size: 0.85rem;
}
.tools-note strong { color: var(--accent-color); font-weight: 400; }

@media (max-width: 700px) {
    .tool-card { padding: 26px 20px 22px; }
    .tool-card h4 { font-size: 1.3rem; }
    .tool-actions { flex-direction: column; align-items: flex-start; gap: 10px; }
}