:root {
    --blue: #102a43;
    --blue-light: #1f4e79;
    --gray: #f4f6f8;
    --text: #243b53;
    --muted: #627d98;
    --white: #ffffff;
    --accent: #f0b429;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: var(--white);
}

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

.container {
    width: min(1120px, 92%);
    margin: 0 auto;
}

header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid #e5eaf0;
    backdrop-filter: blur(8px);
}

.nav {
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 800;
    color: var(--blue);
    font-size: 1.1rem;
}

.nav a.button {
    padding: 0.75rem 1.1rem;
    background: var(--blue);
    color: white;
    border-radius: 999px;
    font-weight: 700;
}

.hero {
    padding: 6rem 0 5rem;
    background: linear-gradient(135deg, #f7fafc 0%, #eaf2f8 100%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background: #e6f0f7;
    color: var(--blue-light);
    border-radius: 999px;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.4rem, 5vw, 4.5rem);
    line-height: 1.05;
    color: var(--blue);
    margin-bottom: 1.4rem;
}

.hero p {
    font-size: 1.25rem;
    color: var(--muted);
    max-width: 720px;
    margin-bottom: 2rem;
}

.cta-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

.btn-primary {
    display: inline-block;
    background: var(--blue);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 999px;
    font-weight: 800;
    box-shadow: 0 10px 25px rgba(16, 42, 67, 0.18);
}

.btn-secondary {
    display: inline-block;
    border: 2px solid var(--blue);
    color: var(--blue);
    padding: 0.9rem 1.4rem;
    border-radius: 999px;
    font-weight: 800;
}

.hero-card {
    background: white;
    border-radius: 24px;
    padding: 2rem;
    box-shadow: 0 20px 50px rgba(16, 42, 67, 0.12);
}

.hero-card h3 {
    color: var(--blue);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.hero-card ul {
    list-style: none;
    display: grid;
    gap: 0.8rem;
}

.hero-card li::before {
    content: "✓";
    color: var(--blue-light);
    font-weight: 900;
    margin-right: 0.6rem;
}

section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 3rem;
}

.section-title h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    color: var(--blue);
    margin-bottom: 1rem;
}

.section-title p {
    color: var(--muted);
    font-size: 1.1rem;
}

.cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.2rem;
}

.card {
    background: var(--gray);
    padding: 1.5rem;
    border-radius: 20px;
    min-height: 160px;
}

.card span {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.8rem;
}

.card h3 {
    color: var(--blue);
    margin-bottom: 0.4rem;
}

.proposal {
    background: var(--blue);
    color: white;
}

.proposal .section-title h2,
.proposal .section-title p {
    color: white;
}

.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.step {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1.5rem;
    border-radius: 18px;
}

.step strong {
    display: block;
    font-size: 1.8rem;
    margin-bottom: 0.6rem;
    color: var(--accent);
}

.not-section {
    background: #f8fafc;
}

.not-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.not-item {
    background: white;
    padding: 1.2rem 1.4rem;
    border-radius: 16px;
    border: 1px solid #e5eaf0;
    font-weight: 700;
    color: var(--blue);
}

.argument {
    max-width: 850px;
    margin: 0 auto;
    background: #f4f6f8;
    border-left: 6px solid var(--accent);
    padding: 2rem;
    border-radius: 18px;
    font-size: 1.15rem;
}

.benefits {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    text-align: center;
}

.benefit {
    padding: 1.4rem;
    border-radius: 16px;
    background: var(--gray);
    font-weight: 800;
    color: var(--blue);
}

.final-cta {
    background: linear-gradient(135deg, var(--blue), var(--blue-light));
    color: white;
    text-align: center;
    padding: 5rem 1rem;
}

.final-cta h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.final-cta p {
    font-size: 1.15rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.final-cta .btn-primary {
    background: white;
    color: var(--blue);
}

footer {
    padding: 2rem 0;
    background: #0b1f33;
    color: #cbd5e1;
    font-size: 0.9rem;
}

footer .container {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.flip-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.flip-card {
    perspective: 1200px;
    height: 220px;
    cursor: pointer;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card.active .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 24px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.flip-card-front {
    background: white;
    border: 1px solid #e5eaf0;
    box-shadow: 0 10px 30px rgba(16, 42, 67, 0.06);
}

.flip-card-front span {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.flip-card-front h3 {
    color: var(--blue);
    font-size: 1.25rem;
    line-height: 1.3;
}

.flip-card-back {
    background: linear-gradient(135deg, #102a43, #1f4e79);
    color: white;
    transform: rotateY(180deg);
    box-shadow: 0 20px 40px rgba(16, 42, 67, 0.18);
}

.flip-card-back p {
    font-size: 1rem;
    line-height: 1.6;
}

.flip-note {
    text-align: center;
    margin-top: 2rem;
    color: var(--muted);
    font-size: 0.95rem;
}

@media (max-width: 850px) {

    .flip-grid {
        grid-template-columns: 1fr;
    }

    .flip-card {
        height: 240px;
    }

}

@media (max-width: 850px) {

    .hero-grid,
    .cards,
    .steps,
    .benefits {
        grid-template-columns: 1fr;
    }

    .not-grid {
        grid-template-columns: 1fr;
    }

    .nav {
        height: auto;
        padding: 1rem 0;
        gap: 1rem;
    }

    .hero {
        padding: 4rem 0;
    }
}