/* ═══════════════════════════════════════════════════════
   style.css — DEV//KNOWLEDGE Landing Page
   Tema: Retrô Terminal / TRON / High-Contrast Industrial
════════════════════════════════════════════════════════ */

/* ── VARIÁVEIS ── */
:root {
     --black: #000000;
     --orange: #FF6600;
     --orange-dim: #cc5200;
     --orange-glow: rgba(255, 102, 0, 0.18);
     --white: #ffffff;
     --grey-light: #cccccc;
     --grey-mid: #888888;
     --grey-dark: #1a1a1a;
     --border: rgba(255, 102, 0, 0.35);
     --font-main: 'Roboto', sans-serif;
     --font-mono: 'Roboto Mono', monospace;
     --nav-h: 64px;
}

/* ── RESET ── */
*,
*::before,
*::after {
     box-sizing: border-box;
     margin: 0;
     padding: 0;
}

html {
     scroll-behavior: smooth;
     font-size: 16px;
}

body {
     background-color: var(--black);
     color: var(--white);
     font-family: var(--font-main);
     line-height: 1.6;
     overflow-x: hidden;
}

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

/* ── UTILITÁRIOS ── */
.accent {
     color: var(--orange);
}

/* ══════════════════════════════════════════════════════
   NAV BAR FIXA
══════════════════════════════════════════════════════ */
.navbar {
     position: fixed;
     top: 0;
     left: 0;
     width: 100%;
     height: var(--nav-h);
     background: rgba(0, 0, 0, 0.92);
     border-bottom: 1px solid var(--border);
     backdrop-filter: blur(6px);
     z-index: 999;
}

.nav-inner {
     max-width: 1100px;
     margin: 0 auto;
     height: 100%;
     padding: 0 24px;
     display: flex;
     align-items: center;
     justify-content: space-between;
}

/* Logo */
.nav-logo {
     font-family: var(--font-mono);
     font-size: 1rem;
     font-weight: 700;
     letter-spacing: 0.08em;
     color: var(--white);
     user-select: none;
}

/* Links da nav */
.nav-links {
     display: flex;
     align-items: center;
     gap: 28px;
}

.nav-links a {
     font-family: var(--font-mono);
     font-size: 0.78rem;
     letter-spacing: 0.1em;
     color: var(--grey-light);
     transition: color 0.2s;
}

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

/* Botão da nav */
.btn-nav {
     font-family: var(--font-mono);
     font-size: 0.75rem;
     font-weight: 700;
     letter-spacing: 0.12em;
     color: var(--orange) !important;
     border: 1px solid var(--orange);
     padding: 8px 18px;
     transition: background 0.2s, color 0.2s;
}

.btn-nav:hover {
     background: var(--orange);
     color: var(--black) !important;
}

/* ══════════════════════════════════════════════════════
   BOTÃO PRIMÁRIO (reutilizável)
══════════════════════════════════════════════════════ */
.btn-primary {
     display: inline-block;
     font-family: var(--font-mono);
     font-size: 0.82rem;
     font-weight: 700;
     letter-spacing: 0.12em;
     color: var(--black);
     background: var(--orange);
     border: 2px solid var(--orange);
     padding: 12px 28px;
     cursor: pointer;
     transition: background 0.2s, color 0.2s, box-shadow 0.2s;
     white-space: nowrap;
}

.btn-primary:hover {
     background: transparent;
     color: var(--orange);
     box-shadow: 0 0 18px var(--orange-glow);
}

/* ══════════════════════════════════════════════════════
   HERO SECTION
══════════════════════════════════════════════════════ */
.hero {
     position: relative;
     min-height: 100vh;
     display: flex;
     align-items: center;
     justify-content: center;
     padding: calc(var(--nav-h) + 40px) 24px 80px;
     overflow: hidden;
}

/* Grade de fundo decorativa */
.hero-grid-bg {
     position: absolute;
     inset: 0;
     background-image:
          linear-gradient(rgba(255, 102, 0, 0.06) 1px, transparent 1px),
          linear-gradient(90deg, rgba(255, 102, 0, 0.06) 1px, transparent 1px);
     background-size: 48px 48px;
     pointer-events: none;
     z-index: 0;
}

/* Vignette sobre a grade */
.hero::before {
     content: '';
     position: absolute;
     inset: 0;
     background: radial-gradient(ellipse at center, transparent 40%, rgba(0, 0, 0, 0.85) 100%);
     z-index: 1;
     pointer-events: none;
}

.hero-content {
     position: relative;
     z-index: 2;
     text-align: center;
     max-width: 820px;
}

/* Label topo */
.hero-label {
     font-family: var(--font-mono);
     font-size: 0.78rem;
     letter-spacing: 0.2em;
     color: var(--orange);
     margin-bottom: 20px;
     text-transform: uppercase;
}

/* Título principal */
.hero-title {
     font-family: var(--font-main);
     font-size: clamp(2.2rem, 6vw, 4.5rem);
     font-weight: 900;
     line-height: 1.1;
     letter-spacing: -0.01em;
     text-transform: uppercase;
     color: var(--white);
     margin-bottom: 24px;
}

/* Subtítulo */
.hero-sub {
     font-size: 1rem;
     color: var(--grey-light);
     font-weight: 300;
     margin-bottom: 40px;
     line-height: 1.7;
}

/* Cantos decorativos TRON */
.corner {
     position: absolute;
     width: 28px;
     height: 28px;
     z-index: 2;
     pointer-events: none;
}

.c-tl {
     top: calc(var(--nav-h) + 20px);
     left: 20px;
     border-top: 2px solid var(--orange);
     border-left: 2px solid var(--orange);
}

.c-tr {
     top: calc(var(--nav-h) + 20px);
     right: 20px;
     border-top: 2px solid var(--orange);
     border-right: 2px solid var(--orange);
}

.c-bl {
     bottom: 20px;
     left: 20px;
     border-bottom: 2px solid var(--orange);
     border-left: 2px solid var(--orange);
}

.c-br {
     bottom: 20px;
     right: 20px;
     border-bottom: 2px solid var(--orange);
     border-right: 2px solid var(--orange);
}

/* ══════════════════════════════════════════════════════
   SEÇÃO E-BOOKS
══════════════════════════════════════════════════════ */
.ebooks {
     max-width: 1100px;
     margin: 0 auto;
     padding: 80px 24px 100px;
     display: flex;
     flex-direction: column;
     gap: 48px;
}

/* Label da seção */
.section-label {
     font-family: var(--font-mono);
     font-size: 0.78rem;
     letter-spacing: 0.2em;
     color: var(--orange);
     text-align: center;
     margin-bottom: -16px;
}

/* ── CARD ── */
.card {
     background: var(--grey-dark);
     border: 1px solid var(--border);
     padding: 40px 44px;
     position: relative;
     transition: border-color 0.3s, box-shadow 0.3s;
}

.card::before {
     /* Linha laranja esquerda */
     content: '';
     position: absolute;
     left: 0;
     top: 0;
     bottom: 0;
     width: 4px;
     background: var(--orange);
     opacity: 0.6;
     transition: opacity 0.3s;
}

.card:hover {
     border-color: var(--orange);
     box-shadow: 0 0 32px var(--orange-glow);
}

.card:hover::before {
     opacity: 1;
}

/* Header do card */
.card-header {
     display: flex;
     align-items: center;
     gap: 16px;
     margin-bottom: 16px;
}

.card-num {
     font-family: var(--font-mono);
     font-size: 2rem;
     font-weight: 700;
     color: var(--orange);
     line-height: 1;
}

.card-tag {
     font-family: var(--font-mono);
     font-size: 0.68rem;
     letter-spacing: 0.18em;
     color: var(--grey-mid);
     text-transform: uppercase;
     border: 1px solid rgba(255, 255, 255, 0.12);
     padding: 4px 10px;
}

/* Título do card */
.card-title {
     font-size: 1.55rem;
     font-weight: 700;
     letter-spacing: -0.01em;
     color: var(--white);
     margin-bottom: 14px;
     text-transform: uppercase;
}

/* Descrição */
.card-desc {
     font-size: 0.95rem;
     color: var(--grey-light);
     font-weight: 300;
     line-height: 1.7;
     margin-bottom: 24px;
     max-width: 680px;
}

/* Lista de tópicos */
.card-topics {
     list-style: none;
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 8px 32px;
     margin-bottom: 36px;
}

.card-topics li {
     font-family: var(--font-mono);
     font-size: 0.82rem;
     color: var(--grey-light);
     letter-spacing: 0.03em;
     padding-bottom: 8px;
     border-bottom: 1px solid rgba(255, 255, 255, 0.07);
     transition: color 0.2s;
}

.card-topics li:hover {
     color: var(--orange);
}

/* Footer do card */
.card-footer {
     display: flex;
     align-items: center;
     justify-content: space-between;
     gap: 20px;
     padding-top: 28px;
     border-top: 1px solid rgba(255, 255, 255, 0.08);
     flex-wrap: wrap;
}

.card-price {
     font-family: var(--font-mono);
     font-size: 1.6rem;
     font-weight: 700;
     color: var(--orange);
     letter-spacing: 0.04em;
}

/* ══════════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════════ */
.footer {
     background: var(--grey-dark);
     border-top: 1px solid var(--border);
     padding: 60px 24px;
     text-align: center;
}

.footer-inner {
     max-width: 600px;
     margin: 0 auto;
     display: flex;
     flex-direction: column;
     align-items: center;
     gap: 16px;
}

.footer-desc {
     font-size: 0.92rem;
     color: var(--grey-mid);
     font-weight: 300;
}

.footer-contacts {
     display: flex;
     flex-direction: column;
     gap: 12px;
     align-items: center;
}

.footer-contacts a {
     font-family: var(--font-mono);
     font-size: 0.88rem;
     color: var(--orange);
     letter-spacing: 0.05em;
     display: flex;
     align-items: center;
     gap: 10px;
     padding: 8px 20px;
     border: 1px solid rgba(255, 102, 0, 0.2);
     transition: border-color 0.2s, background 0.2s, color 0.2s;
     min-width: 280px;
     justify-content: center;
}

.footer-contacts a:hover {
     border-color: var(--orange);
     background: var(--orange-glow);
     color: var(--white);
}

.contact-icon {
     font-size: 1rem;
     color: var(--orange);
     line-height: 1;
}

.footer-copy {
     font-family: var(--font-mono);
     font-size: 0.68rem;
     letter-spacing: 0.12em;
     color: var(--grey-mid);
     margin-top: 16px;
}

/* ══════════════════════════════════════════════════════
   RESPONSIVIDADE
══════════════════════════════════════════════════════ */
@media (max-width: 768px) {
     .nav-links a:not(.btn-nav) {
          display: none;
     }

     .hero-title {
          font-size: clamp(1.9rem, 9vw, 3rem);
     }

     .hero-sub {
          font-size: 0.92rem;
     }

     .card {
          padding: 28px 22px;
     }

     .card-topics {
          grid-template-columns: 1fr;
     }

     .card-footer {
          flex-direction: column;
          align-items: flex-start;
     }

     .card-title {
          font-size: 1.2rem;
     }
}

@media (max-width: 480px) {
     .hero-label {
          font-size: 0.65rem;
     }

     .section-label {
          font-size: 0.65rem;
     }

     .ebooks {
          padding: 60px 16px 80px;
     }

     .card {
          padding: 22px 16px;
     }
}