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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    background: #f4f8ff;
    color: #0f172a;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: min(1140px, calc(100% - 32px));
    margin: auto;
}

/* TOPBAR */
.topbar {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #dbe4f0;
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.topbar-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.home-btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 999px;
    background: #0f172a;
    color: #ffffff;
    font-weight: 700;
    transition: 0.3s ease;
}

.home-btn:hover {
    transform: translateY(-2px);
    background: #1e293b;
}

.class-badge {
    padding: 8px 14px;
    border-radius: 999px;
    background: #dbeafe;
    color: #1e3a8a;
    font-weight: 700;
}

/* HERO */
.hero {
    padding: 34px 0 20px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 24px;
    align-items: stretch;
}

.hero-left {
    background: linear-gradient(135deg, #ffffff, #eef4ff);
    border: 1px solid #dbe4f0;
    border-radius: 30px;
    padding: 36px;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.06);
}

.hero-label {
    display: inline-block;
    padding: 7px 13px;
    border-radius: 999px;
    background: #e0ecff;
    color: #1e40af;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 14px;
}

.hero-left h1 {
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.15;
    margin-bottom: 12px;
}

.hero-left p {
    max-width: 680px;
    color: #475569;
    margin-bottom: 22px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    border-radius: 14px;
    font-weight: 700;
    transition: 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #ffffff;
    box-shadow: 0 10px 22px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
    transform: translateY(-3px);
}

.btn-secondary {
    background: #ffffff;
    color: #0f172a;
    border: 1px solid #cbd5e1;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    background: #f8fafc;
}

.hero-right {
    display: flex;
}

.hero-card {
    width: 100%;
    background: #0f172a;
    color: #ffffff;
    border-radius: 30px;
    padding: 26px;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.14);
    display: grid;
    gap: 12px;
}

.hero-card-item {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    padding: 14px 16px;
}

.hero-card-item strong {
    display: block;
    margin-bottom: 4px;
    color: #93c5fd;
}

.hero-card-item span {
    color: #cbd5e1;
    font-size: 0.92rem;
}

/* STATS */
.stats-section {
    padding: 18px 0 20px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.stat-box {
    background: #ffffff;
    border: 1px solid #dbe4f0;
    border-radius: 22px;
    padding: 22px;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.04);
}

.stat-box h3 {
    margin-bottom: 6px;
    font-size: 1.08rem;
}

.stat-box p {
    color: #475569;
    font-size: 0.95rem;
}

/* COMMON */
section {
    padding: 70px 0;
}

.section-head {
    text-align: center;
    margin-bottom: 34px;
}

.mini-title {
    display: inline-block;
    color: #2563eb;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 800;
    font-size: 0.84rem;
    margin-bottom: 10px;
}

.section-head h2 {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    margin-bottom: 10px;
}

/* SECTION GRID */
.sections-area {
    background: #ffffff;
}

.section-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
}

.section-card {
    background: #f8fbff;
    border: 1px solid #dbe4f0;
    border-radius: 26px;
    padding: 24px;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.04);
    transition: 0.3s ease;
}

.section-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 34px rgba(15, 23, 42, 0.08);
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    gap: 12px;
}

.card-number {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    color: #1e3a8a;
    font-weight: 800;
}

.card-tag {
    padding: 7px 12px;
    border-radius: 999px;
    background: #e0ecff;
    color: #1e40af;
    font-size: 0.78rem;
    font-weight: 700;
}

.section-card h3 {
    margin-bottom: 8px;
    font-size: 1.18rem;
}

.section-card p {
    color: #475569;
    margin-bottom: 16px;
}

/* BUTTONS */
.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 12px;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 48px;
    padding: 11px 14px;
    border-radius: 16px;
    font-size: 0.92rem;
    font-weight: 700;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

.open-btn {
    background: #f8f6f2;
    color: #1d4ed8;
    border: 1px solid #d6dde8;
}

.open-btn:hover {
    transform: translateY(-2px);
    background: #eef4ff;
}

.download-btn-small {
    background: #081635;
    color: #ffffff;
    border: 1px solid #081635;
}

.download-btn-small:hover {
    transform: translateY(-2px);
    background: #102044;
}

/* DOWNLOADS */
.downloads-section {
    background: #ffffff;
}

.download-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: center;
    background: linear-gradient(135deg, #0f172a, #1e293b);
    border-radius: 30px;
    padding: 34px;
    color: #ffffff;
}

.download-left h2 {
    margin: 10px 0;
    font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.download-left p {
    color: #cbd5e1;
}

.download-right {
    display: grid;
    gap: 12px;
}

.download-btn {
    display: block;
    text-align: center;
    background: #ffffff;
    color: #0f172a;
    padding: 14px 16px;
    border-radius: 14px;
    font-weight: 700;
    transition: 0.3s ease;
}

.download-btn:hover {
    transform: translateY(-3px);
    background: #bfdbfe;
}

/* FOOTER */
.footer {
    background: #0f172a;
    color: #e2e8f0;
    padding: 28px 0;
}

.footer-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer p {
    color: #cbd5e1;
    margin-top: 6px;
}

.footer-home {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 999px;
    background: #2563eb;
    color: #ffffff;
    font-weight: 700;
    transition: 0.3s ease;
}

.footer-home:hover {
    transform: translateY(-2px);
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero-grid,
    .download-box,
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 860px) {
    .hero-grid,
    .stats-grid,
    .download-box,
    .section-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    section {
        padding: 54px 0;
    }

    .hero-left,
    .hero-card,
    .stat-box,
    .section-card,
    .download-box {
        padding: 20px;
    }

    .hero {
        padding: 26px 0 14px;
    }

    .topbar-wrap,
    .footer-wrap {
        flex-direction: column;
        align-items: flex-start;
    }

    .button-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .action-btn {
        min-height: 44px;
        font-size: 0.82rem;
        padding: 10px 10px;
    }
}