/* ═══════════════════════════════════════════════════════════════
   JOÃOGPT — Main Stylesheet
   Design system: AI Premium · Dark Mode · Minimalismo Futurista
   ═══════════════════════════════════════════════════════════════ */

/* ── Variables ────────────────────────────────────────────────── */
:root {
  /* Colors */
  --void:         #080810;
  --abyss:        #0D0D1A;
  --surface:      #13131F;
  --surface-high: #1C1C2E;
  --border:       #2A2A42;
  --border-light: #33334d;

  --electric: #C4F55A;
  --cyan:     #9EE33A;
  --neon:     #E8FF8A;
  --pulse:    #76E030;

  --text-primary:   #E8E8F0;
  --text-secondary: #8B8B9E;
  --text-muted:     #4A4A62;

  /* Gradients */
  --gradient-brand:  linear-gradient(135deg, #C4F55A, #9EE33A);
  --gradient-glow:   linear-gradient(135deg, rgba(196,245,90,0.15), rgba(158,227,58,0.15));
  --gradient-subtle: linear-gradient(180deg, rgba(196,245,90,0.06) 0%, transparent 60%);

  /* Typography */
  --font-headline: 'Space Grotesk', -apple-system, sans-serif;
  --font-body:     'Inter', -apple-system, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', monospace;

  /* Fluid type scale */
  --text-xs:   clamp(0.7rem,  1.2vw, 0.75rem);
  --text-sm:   clamp(0.8rem,  1.5vw, 0.875rem);
  --text-base: clamp(0.9rem,  1.8vw, 1rem);
  --text-lg:   clamp(1rem,    2vw,   1.125rem);
  --text-xl:   clamp(1.1rem,  2.5vw, 1.25rem);
  --text-2xl:  clamp(1.3rem,  3vw,   1.5rem);
  --text-3xl:  clamp(1.7rem,  4vw,   2.25rem);
  --text-4xl:  clamp(2.2rem,  5.5vw, 3.5rem);
  --text-5xl:  clamp(3rem,    8vw,   5.5rem);

  /* Spacing */
  --nav-h:         68px;
  --section-py:    clamp(72px, 12vw, 128px);
  --container-w:   1160px;
  --container-px:  clamp(20px, 5vw, 40px);

  /* Effects */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;

  --shadow-glow-sm:  0 0 20px rgba(196, 245, 90, 0.12);
  --shadow-glow-md:  0 0 40px rgba(196, 245, 90, 0.18);
  --shadow-glow-lg:  0 0 80px rgba(196, 245, 90, 0.2);
  --shadow-card:     0 4px 24px rgba(0, 0, 0, 0.4);

  /* Animation */
  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:   cubic-bezier(0.7, 0, 0.84, 0);
  --t-fast:    0.15s ease;
  --t-base:    0.25s ease;
  --t-slow:    0.4s var(--ease-out);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--void);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

input {
  font-family: inherit;
}

/* ── Utilities ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ──────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  transition: all var(--t-base);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #080810;
  box-shadow: 0 0 0 1px rgba(196, 245, 90, 0.2), var(--shadow-glow-sm);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(196, 245, 90, 0.4), var(--shadow-glow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-light);
  background: rgba(255, 255, 255, 0.03);
}

.btn-sm {
  padding: 8px 16px;
  font-size: var(--text-xs);
}

/* ── Navigation ───────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background var(--t-slow), border-color var(--t-slow), backdrop-filter var(--t-slow);
}

.nav.scrolled {
  background: rgba(8, 8, 16, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom-color: var(--border);
}

.nav-container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--container-px);
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  flex-shrink: 0;
}

.nav-logo span {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-center {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.nav-link {
  padding: 6px 12px;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.nav-end {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.nav-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
}

.nav-icon:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* ── Hero ─────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}

.hero-bg-glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -5%, rgba(196, 245, 90, 0.12), transparent 65%),
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(158, 227, 58, 0.05), transparent 60%),
    radial-gradient(ellipse 30% 30% at 20% 80%, rgba(196, 245, 90, 0.03), transparent 50%);
  pointer-events: none;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(196, 245, 90, 0.07) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, black 0%, transparent 80%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  padding-top: clamp(48px, 8vw, 80px);
  padding-bottom: clamp(80px, 12vw, 120px);
}

.hero-content {
  max-width: 760px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 100px;
  border: 1px solid rgba(196, 245, 90, 0.3);
  background: rgba(196, 245, 90, 0.06);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.badge-pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--electric);
  box-shadow: 0 0 0 0 rgba(108, 99, 255, 0.6);
  animation: pulse-ring 2.5s ease infinite;
}

@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 rgba(196, 245, 90, 0.6); }
  70%  { box-shadow: 0 0 0 8px rgba(196, 245, 90, 0); }
  100% { box-shadow: 0 0 0 0 rgba(196, 245, 90, 0); }
}

.hero-headline {
  font-family: var(--font-headline);
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 540px;
  margin-bottom: 40px;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero-social {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.social-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--t-base);
}

.social-pill:hover {
  color: var(--text-primary);
  border-color: var(--border-light);
  background: rgba(255, 255, 255, 0.05);
}

/* ── Section Shared ───────────────────────────────────────────── */
.section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--electric);
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-headline);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
}

.section-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  white-space: nowrap;
  transition: color var(--t-fast);
  padding-bottom: 4px;
}

.section-link:hover {
  color: var(--text-primary);
}

/* ── Articles ─────────────────────────────────────────────────── */
.articles-section {
  padding: var(--section-py) 0;
  border-top: 1px solid var(--border);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.article-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: border-color var(--t-base), box-shadow var(--t-base), transform var(--t-base);
  overflow: hidden;
}

.article-card:hover {
  border-color: rgba(196, 245, 90, 0.45);
  box-shadow: 0 0 0 1px rgba(196, 245, 90, 0.1), var(--shadow-glow-sm), var(--shadow-card);
  transform: translateY(-2px);
}

.article-card.featured {
  grid-column: span 1;
}

.article-card-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 24px;
  gap: 0;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid currentColor;
}

.tag-launch {
  color: var(--electric);
  border-color: rgba(196, 245, 90, 0.35);
  background: rgba(196, 245, 90, 0.08);
}

.tag-analysis {
  color: var(--neon);
  border-color: rgba(232, 255, 138, 0.35);
  background: rgba(232, 255, 138, 0.08);
}

.tag-model {
  color: var(--cyan);
  border-color: rgba(158, 227, 58, 0.35);
  background: rgba(158, 227, 58, 0.08);
}

.tag-tool {
  color: var(--pulse);
  border-color: rgba(118, 224, 48, 0.35);
  background: rgba(118, 224, 48, 0.08);
}

.article-date,
.article-read {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.article-date::after {
  content: '·';
  margin-left: 10px;
}

.article-title {
  font-family: var(--font-headline);
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 12px;
  transition: color var(--t-fast);
}

.article-card:hover .article-title {
  color: #fff;
}

.article-excerpt {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 20px;
}

.article-footer {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.article-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--electric);
  transition: gap var(--t-fast);
}

.article-card:hover .article-cta {
  gap: 10px;
}

/* ── About ────────────────────────────────────────────────────── */
.about-section {
  padding: var(--section-py) 0;
  border-top: 1px solid var(--border);
  background:
    radial-gradient(ellipse 60% 60% at 100% 50%, rgba(196, 245, 90, 0.04), transparent),
    var(--void);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(48px, 8vw, 96px);
  align-items: center;
}

.about-headline {
  font-family: var(--font-headline);
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 24px;
  margin-top: 16px;
}

.about-text {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 460px;
}

.about-ctas {
  margin-top: 32px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stat-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: border-color var(--t-base), transform var(--t-base);
}

.stat-card:hover {
  border-color: rgba(196, 245, 90, 0.3);
  transform: translateX(4px);
}

.stat-value {
  font-family: var(--font-headline);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.stat-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Newsletter ───────────────────────────────────────────────── */
.newsletter-section {
  padding: var(--section-py) 0;
  border-top: 1px solid var(--border);
}

.newsletter-card {
  position: relative;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(196, 245, 90, 0.2);
  background: var(--surface);
  padding: clamp(48px, 8vw, 80px) clamp(32px, 6vw, 80px);
  text-align: center;
  overflow: hidden;
}

.newsletter-glow {
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(196, 245, 90, 0.10), transparent 70%);
  pointer-events: none;
}

.newsletter-content {
  position: relative;
  z-index: 1;
  max-width: 540px;
  margin: 0 auto;
}

.newsletter-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-high);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  color: var(--electric);
}

.newsletter-headline {
  font-family: var(--font-headline);
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.newsletter-sub {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 40px;
}

.form-group {
  display: flex;
  gap: 8px;
  max-width: 440px;
  margin: 0 auto 12px;
}

.form-input {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-high);
  color: var(--text-primary);
  font-size: var(--text-sm);
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-input:focus {
  border-color: rgba(196, 245, 90, 0.5);
  box-shadow: 0 0 0 3px rgba(196, 245, 90, 0.1);
}

.form-btn {
  position: relative;
  min-width: 140px;
  flex-shrink: 0;
}

.btn-loading {
  display: none;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.form-note {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.5;
}

.newsletter-success {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(34, 197, 94, 0.3);
  background: rgba(34, 197, 94, 0.08);
  color: #4ade80;
  font-size: var(--text-sm);
}

.success-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(34, 197, 94, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ── Footer ───────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: clamp(48px, 8vw, 64px) 0 32px;
  background: var(--abyss);
}

.footer-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-logo {
  display: block;
  margin-bottom: 10px;
  font-size: 1rem;
}

.footer-tagline {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: 24px;
}

.footer-social {
  display: flex;
  gap: 4px;
}

.footer-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: color var(--t-fast), background var(--t-fast);
}

.footer-icon:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.footer-nav {
  display: flex;
  justify-content: flex-end;
  gap: 64px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col-title {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.footer-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color var(--t-fast);
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  gap: 16px;
  flex-wrap: wrap;
}

.footer-copy,
.footer-sub {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ── Scroll Animations ────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-stats {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .stat-card {
    flex: 1;
    min-width: 200px;
  }
}

@media (max-width: 768px) {
  .nav-center {
    display: none;
  }

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

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .form-group {
    flex-direction: column;
  }

  .form-btn {
    width: 100%;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-nav {
    justify-content: flex-start;
    gap: 40px;
  }

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

  .hero-ctas {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-ctas .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .about-stats {
    flex-direction: column;
  }

  .newsletter-card {
    padding: 40px 24px;
  }
}

/* ── Loading state ────────────────────────────────────────────── */
.form-btn.loading .btn-text    { display: none; }
.form-btn.loading .btn-loading { display: flex; }