@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;600;700;800&display=swap');

:root {
    --bg-dark: #050714;
    --card-bg: rgba(18, 24, 43, 0.85);
    --card-border: rgba(255, 255, 255, 0.12);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --pink-accent: #e84393;
    --pink-gradient: linear-gradient(135deg, #fd79a8, #e84393);
    --cyan-accent: #00cec9;
    --cyan-gradient: linear-gradient(135deg, #00cec9, #0984e3);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Outfit', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #000000 !important;
    
    /* Updated extension to .png */
    background-image: url('images/bg-molecules.png') !important;
    
    background-size: cover !important;
    background-position: center center !important;
    background-repeat: no-repeat !important;
    background-attachment: fixed !important;
    color: var(--text-main);
    max-width: 980px;
    margin: 40px auto;
    padding: 20px;
}

/* MAIN CONTAINER (GLASSMORPHISM) */
.portal-card, .adventure-card, .hub-card {
    background: var(--card-bg);
    border-radius: 28px !important;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    overflow: hidden;
    border: 1px solid var(--card-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: relative;
    border-bottom: none !important;
}

/* HEADER BANNER */
.header-banner {
    position: relative;
    background: linear-gradient(135deg, rgba(13, 27, 42, 0.9), rgba(27, 38, 59, 0.9));
    padding: 45px 25px;
    text-align: center;
    border-bottom: 1px solid var(--card-border);
    overflow: hidden;
}

/* FLOATING HEADER ANIMATION */
.header-banner img, 
.header-banner svg, 
.header-banner div[class*="icon"],
.card-diagram {
    animation: floatHeaderIcon 3s ease-in-out infinite !important;
}

@keyframes floatHeaderIcon {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-6px); }
}

.header-diagram-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.6;
}

.header-text-content {
    position: relative;
    z-index: 2;
}

.header-text-content h1 {
    margin: 0;
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -0.5px;
    text-shadow: 0 4px 16px rgba(0,0,0,0.5);
    color: #ffffff;
}

.subtitle {
    margin-top: 10px;
    margin-bottom: 0;
    color: #00cec9;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* SELECTION GRID */
.grade-selection-grid, .grid-container, .cards-wrapper, .activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    padding: 40px 30px;
}

/* GRADE CARDS & POP-UP HOVER FX */
.grade-card, .module-card, .subject-card {
    background: rgba(11, 19, 43, 0.7);
    border-radius: 22px;
    padding: 32px 25px;
    text-decoration: none;
    color: #ffffff;
    border: 1px solid var(--card-border);
    transition: transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275), 
                box-shadow 0.25s ease, 
                border-color 0.25s ease !important;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.grade-card:hover, .module-card:hover, .subject-card:hover {
    transform: translateY(-8px) scale(1.02) !important;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5);
}

.grade-card.grade-3:hover {
    border-color: rgba(253, 121, 168, 0.8) !important;
    box-shadow: 0 0 30px rgba(253, 121, 168, 0.35) !important;
}

.grade-card.grade-4:hover {
    border-color: rgba(0, 206, 201, 0.8) !important;
    box-shadow: 0 0 30px rgba(0, 206, 201, 0.35) !important;
}

.grade-badge {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #f1c40f;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 14px;
    letter-spacing: 0.8px;
}

.grade-card h2 {
    margin: 0 0 10px 0;
    font-size: 24px;
    font-weight: 700;
}

.grade-card p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
    flex-grow: 1;
}

.launch-btn, .btn {
    margin-top: 22px;
    padding: 12px 26px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 15px;
    transition: all 0.2s ease;
    color: #ffffff;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.grade-card.grade-3 .launch-btn { background: var(--pink-gradient); }
.grade-card.grade-4 .launch-btn { background: var(--cyan-gradient); }

.grade-card:hover .launch-btn {
    transform: scale(1.05);
}

/* 2. COMPLETELY ERASE THE YELLOW RULER FOOTER */
.ruler-footer,
.ruler-ticks, 
.ruler-ticks::before, 
.ruler-ticks::after,
[class*="ruler"],
[class*="yellow"] {
    display: none !important;
    visibility: hidden !important;
    height: 0 !important;
    max-height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    background: none !important;
    border: none !important;
    opacity: 0 !important;
}