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

:root {
    --indigo:       #5C6BC0;
    --indigo-dark:  #26418F;
    --indigo-light: #8E99F3;
    --gold:         #FFA000;
    --bg:           #FFF8E7;
    --white:        #FFFFFF;
    --text:         #212121;
    --text-soft:    #555555;
    --radius:       16px;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

a {
    color: var(--indigo);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ── NAV ── */
nav {
    background: var(--white);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--indigo-dark);
}

.nav-logo img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.nav-links a {
    margin-left: 20px;
    font-size: 0.95rem;
    color: var(--text-soft);
    font-weight: 500;
}

/* ── HERO ── */
.hero {
    background: linear-gradient(135deg, var(--indigo-dark) 0%, var(--indigo) 60%, var(--indigo-light) 100%);
    color: var(--white);
    text-align: center;
    padding: 72px 24px 80px;
}

.hero-icon {
    width: 100px;
    height: 100px;
    border-radius: 22px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 2.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.hero .tagline {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 32px;
}

.hero .description {
    font-size: 1rem;
    opacity: 0.8;
    max-width: 560px;
    margin: 0 auto 40px;
}

.btn-play {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--white);
    color: var(--indigo-dark);
    font-weight: 700;
    font-size: 1rem;
    padding: 14px 28px;
    border-radius: 50px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    transition: transform 0.15s, box-shadow 0.15s;
}

.btn-play:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.25);
    text-decoration: none;
}

.btn-play img {
    width: 22px;
    height: 22px;
}

.btn-coming-soon {
    display: inline-block;
    background: rgba(255,255,255,0.15);
    color: var(--white);
    font-size: 0.9rem;
    padding: 10px 24px;
    border-radius: 50px;
    border: 2px solid rgba(255,255,255,0.4);
    cursor: default;
    margin-top: 8px;
}

/* ── SECTION ── */
section {
    max-width: 900px;
    margin: 0 auto;
    padding: 64px 24px;
}

section h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--indigo-dark);
    margin-bottom: 8px;
}

.section-sub {
    color: var(--text-soft);
    margin-bottom: 36px;
    font-size: 1rem;
}

/* ── GRADES ── */
.grades-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
}

.grade-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
    border-top: 4px solid var(--indigo);
}

.grade-card .grade-label {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--indigo);
    margin-bottom: 4px;
}

.grade-card .grade-name {
    font-size: 0.9rem;
    color: var(--text-soft);
    margin-bottom: 10px;
}

.grade-card .badge {
    display: inline-block;
    background: #E8EAF6;
    color: var(--indigo-dark);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
}

.badge-soon {
    background: #FFF3E0 !important;
    color: var(--gold) !important;
}

/* ── SUBJECTS ── */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
}

.subject-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 20px 12px;
    text-align: center;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
    font-weight: 600;
    font-size: 0.95rem;
}

.subject-card .subject-icon {
    font-size: 2rem;
    margin-bottom: 8px;
    display: block;
}

/* ── FEATURES ── */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px 20px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}

.feature-card .feat-icon {
    font-size: 2rem;
    margin-bottom: 12px;
    display: block;
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--indigo-dark);
    margin-bottom: 6px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-soft);
}

/* ── SCREENSHOTS ── */
.screenshots-row {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.screenshots-row img {
    height: 480px;
    border-radius: var(--radius);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    flex-shrink: 0;
}

.screenshots-placeholder {
    background: var(--white);
    border: 2px dashed var(--indigo-light);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    color: var(--text-soft);
    font-size: 0.95rem;
}

/* ── DIVIDER ── */
.section-divider {
    border: none;
    border-top: 1px solid #E0E0E0;
    max-width: 900px;
    margin: 0 auto;
}

/* ── FOOTER ── */
footer {
    background: var(--indigo-dark);
    color: rgba(255,255,255,0.8);
    text-align: center;
    padding: 36px 24px;
    font-size: 0.9rem;
}

footer a {
    color: var(--indigo-light);
    margin: 0 8px;
}

footer .footer-logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 10px;
}

/* ── PRIVACY PAGE ── */
.privacy-content {
    max-width: 760px;
    margin: 48px auto;
    padding: 0 24px 64px;
}

.privacy-content h1 {
    font-size: 2rem;
    color: var(--indigo-dark);
    margin-bottom: 8px;
}

.privacy-content .updated {
    color: var(--text-soft);
    font-size: 0.9rem;
    margin-bottom: 36px;
}

.privacy-content h2 {
    font-size: 1.2rem;
    color: var(--indigo-dark);
    margin: 28px 0 8px;
}

.privacy-content p, .privacy-content ul {
    font-size: 0.97rem;
    color: var(--text-soft);
    margin-bottom: 12px;
}

.privacy-content ul {
    padding-left: 20px;
}

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
    .hero h1 { font-size: 1.8rem; }
    .nav-links { display: none; }
    .screenshots-row img { height: 340px; }
}