/* ============================================================
   DESIGN SYSTEM — Variáveis globais
============================================================ */
:root {
    /* Cores */
    --color-navy: #0a1628;
    --color-navy-light: #122039;
    --color-navy-deep: #060e1c;
    --color-gold: #c9a84c;
    --color-gold-hover: #d9b95c;
    --color-text: #e8ecf3;
    --color-muted: #9aa5b8;
    --color-white: #ffffff;
    --color-border: rgba(201, 168, 76, 0.18);

    /* Tipografia */
    --font-display: 'Plus Jakarta Sans', sans-serif;
    --font-body: "Inter", system-ui, sans-serif;

    /* Espaçamentos */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    /* Layout */
    --container: 1200px;
    --radius: 10px;
    --transition: 0.3s ease;
}

/* ============================================================
   RESET / BASE
============================================================ */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-navy);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

img {
    max-width: 100%;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

h1,
h2,
h3 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-white);
}

h1 {
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    font-weight: 600;
}

h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    margin-bottom: var(--space-md);
}

h3 {
    font-size: 1.25rem;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

section {
    padding: var(--space-2xl) 0;
}

/* Botões */
.btn {
    display: inline-block;
    padding: 0.95rem 1.8rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.3px;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--color-gold);
    color: var(--color-navy);
}

.btn-primary:hover {
    background: var(--color-gold-hover);
    transform: translateY(-2px);
}

.btn-outline {
    border-color: var(--color-gold);
    color: var(--color-gold);
}

.btn-outline:hover {
    background: var(--color-gold);
    color: var(--color-navy);
}

/* Animação fade-in */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition:
        opacity 0.8s ease,
        transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   HEADER
============================================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 22, 40, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.1rem var(--space-md);
    max-width: var(--container);
    margin: 0 auto;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
}

.logo span {
    color: var(--color-gold);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links {
    display: flex;
    gap: var(--space-md);
    list-style: none;
}

.nav-links a {
    font-size: 0.92rem;
    color: var(--color-muted);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--color-gold);
}

.nav .btn {
    padding: 0.6rem 1.3rem;
    font-size: 0.85rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
}

.hamburger span {
    width: 100%;
    height: 2px;
    background: var(--color-gold);
    transition: var(--transition);
}

/* ============================================================
   HERO
============================================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background:
        radial-gradient(ellipse at top right,
            rgba(201, 168, 76, 0.12),
            transparent 60%),
        radial-gradient(ellipse at bottom left,
            rgba(201, 168, 76, 0.06),
            transparent 50%),
        linear-gradient(180deg, var(--color-navy-deep), var(--color-navy));
    padding-top: 6rem;
}

.hero-content {
    max-width: 820px;
}

.hero h1 {
    margin-bottom: var(--space-md);
}

.hero h1 span {
    color: var(--color-gold);
}

.hero p {
    font-size: 1.15rem;
    color: var(--color-muted);
    margin-bottom: var(--space-lg);
    max-width: 640px;
}

.hero-buttons {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ============================================================
   STATS
============================================================ */
.stats {
    background: var(--color-navy-light);
    border-block: 1px solid var(--color-border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 4vw, 3rem);
    color: var(--color-gold);
    font-weight: 700;
}

.stat-label {
    color: var(--color-muted);
    font-size: 0.95rem;
    margin-top: 0.4rem;
}

/* ============================================================
   FEATURES — Por que LinguaFlow
============================================================ */
.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto var(--space-xl);
}

.section-header p {
    color: var(--color-muted);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.feature-card {
    background: var(--color-navy-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg) var(--space-md);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-gold);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(201, 168, 76, 0.1);
    color: var(--color-gold);
    border-radius: 50%;
    font-size: 1.4rem;
    margin-bottom: var(--space-sm);
}

.feature-card h3 {
    margin-bottom: 0.6rem;
}

.feature-card p {
    color: var(--color-muted);
    font-size: 0.95rem;
}

/* ============================================================
   COURSES
============================================================ */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.course-card {
    background: linear-gradient(160deg,
            var(--color-navy-light),
            var(--color-navy-deep));
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg);
}

.course-card h3 {
    font-size: 1.8rem;
    color: var(--color-gold);
    margin-bottom: var(--space-sm);
}

.course-meta {
    list-style: none;
    margin: var(--space-md) 0;
}

.course-meta li {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-muted);
    display: flex;
    justify-content: space-between;
}

.course-meta li strong {
    color: var(--color-text);
}

/* ============================================================
   TESTIMONIALS
============================================================ */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.testimonial {
    background: var(--color-navy-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg);
}

.testimonial p {
    font-style: italic;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-gold), #8a6f2c);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--color-navy);
}

.author-name {
    font-weight: 600;
    color: var(--color-white);
}

.author-role {
    font-size: 0.85rem;
    color: var(--color-muted);
}

/* ============================================================
   PRICING
============================================================ */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    align-items: stretch;
}

.price-card {
    background: var(--color-navy-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    position: relative;
}

.price-card.featured {
    border-color: var(--color-gold);
    transform: scale(1.04);
    background: linear-gradient(170deg,
            var(--color-navy-light),
            var(--color-navy-deep));
}

.badge-popular {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-gold);
    color: var(--color-navy);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3rem 0.9rem;
    border-radius: 20px;
    letter-spacing: 0.5px;
}

.price-card h3 {
    margin-bottom: var(--space-sm);
}

.price {
    font-family: var(--font-display);
    font-size: 2.4rem;
    color: var(--color-gold);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.price small {
    font-size: 0.9rem;
    color: var(--color-muted);
    font-family: var(--font-body);
    font-weight: 400;
}

.price-features {
    list-style: none;
    margin-bottom: var(--space-lg);
    flex: 1;
}

.price-features li {
    padding: 0.5rem 0;
    color: var(--color-muted);
    border-bottom: 1px solid var(--color-border);
}

.price-features li::before {
    content: "✓ ";
    color: var(--color-gold);
    font-weight: 700;
}

/* ============================================================
   FAQ
============================================================ */
.faq {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
}

.faq-question {
    width: 100%;
    text-align: left;
    padding: var(--space-md) 0;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-white);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: "+";
    color: var(--color-gold);
    font-size: 1.6rem;
    transition: transform var(--transition);
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition:
        max-height 0.4s ease,
        padding 0.4s ease;
    color: var(--color-muted);
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding-bottom: var(--space-md);
}

/* ============================================================
   CTA FINAL
============================================================ */
.cta-final {
    text-align: center;
    background: linear-gradient(135deg,
            var(--color-navy-deep),
            var(--color-navy-light));
    border-block: 1px solid var(--color-border);
}

.cta-final h2 {
    margin-bottom: var(--space-sm);
}

.cta-final p {
    color: var(--color-muted);
    margin-bottom: var(--space-lg);
    font-size: 1.1rem;
}

/* ============================================================
   FOOTER
============================================================ */
.footer {
    background: var(--color-navy-deep);
    padding: var(--space-xl) 0 var(--space-md);
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer h4 {
    color: var(--color-gold);
    margin-bottom: var(--space-sm);
    font-size: 0.95rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.footer ul {
    list-style: none;
}

.footer ul li {
    padding: 0.3rem 0;
    color: var(--color-muted);
}

.footer ul li a:hover {
    color: var(--color-gold);
}

.socials {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.socials a {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    color: var(--color-gold);
    transition: var(--transition);
}

.socials a:hover {
    background: var(--color-gold);
    color: var(--color-navy);
}

.copyright {
    text-align: center;
    color: var(--color-muted);
    font-size: 0.85rem;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

/* ============================================================
   RESPONSIVE
============================================================ */
@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .testimonials-grid,
    .pricing-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }

    .price-card.featured {
        transform: none;
    }

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

@media (max-width: 720px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-navy-deep);
        padding: var(--space-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-150%);
        transition: transform 0.4s ease;
    }

    .nav-links.open {
        transform: translateY(0);
    }

    .nav .btn {
        display: none;
    }

    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-sm);
    }

    .stat-number {
        font-size: 1.6rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    section {
        padding: var(--space-xl) 0;
    }

    .course-card,
    .testimonial {
        padding: var(--space-md);
    }
}