/* ============================================
   TennisPro Hub - Promo Website
   Theme: Dark Tech (extracted from Flutter app)
   Framework: Tailwind CSS (CDN) + Custom
   ============================================ */

:root {
  --color-primary: #E31E24;
  --color-primary-dark: #B71C1C;
  --color-accent: #FFD700;
  --color-bg: #1A1A1A;
  --color-bg-lighter: #222222;
  --color-surface: #2A2A2A;
  --color-surface-alt: #3A3A3A;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-muted: rgba(255, 255, 255, 0.54);
  --color-text-hint: rgba(255, 255, 255, 0.38);
  --color-border: rgba(255, 255, 255, 0.12);
  --color-success: #4CAF50;
  --color-gradient-start: #B71C1C;
  --color-gradient-end: #E31E24;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  --border-radius-pill: 24px;
  --font-family: 'Inter', sans-serif;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* === NAVIGATION === */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(26, 26, 26, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  height: 64px;
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px; height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand {
  font-size: 1.4rem; font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  display: flex; align-items: center; gap: 2px;
  white-space: nowrap;
}
.nav-brand .accent { color: var(--color-primary); font-style: italic; }
.nav-links {
  display: flex; list-style: none; gap: 32px; align-items: center;
}
.nav-links a {
  color: var(--color-text-secondary); text-decoration: none;
  font-size: 0.9rem; font-weight: 500;
  transition: color 0.2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--color-primary); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -6px; left: 0; right: 0;
  height: 2px; background: var(--color-primary); border-radius: 1px;
}
.nav-hamburger {
  display: none; background: none; border: none; cursor: pointer;
  padding: 8px; flex-direction: column; gap: 5px;
}
.nav-hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--color-text-primary); border-radius: 2px;
  transition: all 0.3s;
}
.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(26, 26, 26, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column; padding: 20px 24px; gap: 18px;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-links.open { display: flex; }
}

main { padding-top: 64px; }

/* === HERO === */
.hero {
  min-height: calc(100vh - 64px);
  display: flex; align-items: center;
  padding: 60px 24px; max-width: 1400px; margin: 0 auto; gap: 80px;
}
.hero-content { flex: 1; max-width: 620px; }
.hero-badge {
  display: inline-block; background: var(--color-surface);
  color: var(--color-accent); font-size: 0.78rem; font-weight: 600;
  padding: 6px 16px; border-radius: var(--border-radius-pill);
  margin-bottom: 24px; border: 1px solid rgba(255, 215, 0, 0.15);
  letter-spacing: 0.5px; text-transform: uppercase;
}
.hero-title {
  font-size: 3.2rem; font-weight: 700; line-height: 1.08; margin-bottom: 20px;
}
.hero-title .highlight { color: var(--color-primary); }
.hero-subtitle {
  font-size: 1.1rem; color: var(--color-text-secondary);
  margin-bottom: 36px; line-height: 1.7;
}
.hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-mockup { flex: 0 0 auto; display: flex; justify-content: center; }

.device-frame {
  position: relative; width: 300px;
  background: #0D0D0D; border-radius: 40px; padding: 14px 12px;
  box-shadow: 0 40px 80px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.08);
}
.device-frame::before {
  content: ''; position: absolute; top: 6px; left: 50%; transform: translateX(-50%);
  width: 72px; height: 5px; background: #1A1A1A; border-radius: 3px; z-index: 2;
}
.device-frame img {
  width: 100%; border-radius: 28px; display: block;
}

@media (max-width: 768px) {
  .hero { flex-direction: column; text-align: center; padding: 40px 20px; gap: 36px; min-height: auto; }
  .hero-content { max-width: 100%; }
  .hero-title { font-size: 2.2rem; }
  .hero-buttons { justify-content: center; }
  .hero-mockup { order: -1; }
  .device-frame { width: 220px; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 1.8rem; }
  .hero-subtitle { font-size: 0.95rem; }
}

/* === BUTTONS === */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 14px 28px; border-radius: var(--border-radius);
  font-family: var(--font-family); font-size: 0.95rem; font-weight: 600;
  text-decoration: none; cursor: pointer; border: none;
  transition: all 0.2s; text-align: center; line-height: 1;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-gradient-end), var(--color-gradient-start));
  color: #fff;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(227,30,36,0.4);
}
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-surface-alt);
  border-color: rgba(255,255,255,0.2);
}
@media (max-width: 480px) {
  .btn { padding: 12px 22px; font-size: 0.88rem; }
}

/* === SECTIONS === */
.section { padding: 80px 24px; max-width: 1200px; margin: 0 auto; }
.section-dark { background: var(--color-bg-lighter); }
.section-full { max-width: 100%; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: 2rem; font-weight: 700; margin-bottom: 12px;
}
.section-header p {
  color: var(--color-text-secondary); font-size: 1rem; max-width: 560px; margin: 0 auto;
}
@media (max-width: 768px) {
  .section { padding: 56px 20px; }
  .section-header h2 { font-size: 1.6rem; }
}

/* === SCREENSHOT CAROUSEL === */
.screenshot-section { padding: 60px 24px; max-width: 1200px; margin: 0 auto; }
.carousel-wrapper { position: relative; max-width: 960px; margin: 0 auto; overflow: hidden; }
.carousel-track { display: flex; transition: transform 0.4s ease; gap: 20px; }
.carousel-slide { flex: 0 0 auto; width: 200px; }
.carousel-slide .device-mockup {
  position: relative; background: #0D0D0D; border-radius: 26px; padding: 8px 7px;
  box-shadow: 0 12px 36px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.06);
}
.carousel-slide .device-mockup::before {
  content: ''; position: absolute; top: 4px; left: 50%; transform: translateX(-50%);
  width: 48px; height: 4px; background: #1A1A1A; border-radius: 2px; z-index: 2;
}
.carousel-slide .device-mockup img {
  width: 100%; border-radius: 18px; display: block;
  cursor: pointer; transition: filter 0.3s, opacity 0.3s;
}
.carousel-slide .device-mockup img.loading { filter: blur(5px); opacity: 0.6; }
.carousel-nav {
  display: flex; justify-content: center; align-items: center;
  gap: 16px; margin-top: 28px;
}
.carousel-btn {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--color-surface); border: 1px solid var(--color-border);
  color: var(--color-text-primary); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; transition: all 0.2s;
}
.carousel-btn:hover { background: var(--color-primary); border-color: var(--color-primary); }
.carousel-dots { display: flex; gap: 8px; align-items: center; }
.carousel-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-surface-alt); border: none;
  cursor: pointer; transition: all 0.3s; padding: 0;
}
.carousel-dot.active { background: var(--color-primary); width: 24px; border-radius: 4px; }
@media (max-width: 768px) { .carousel-slide { width: 180px; } }
@media (max-width: 480px) {
  .carousel-slide { width: 240px; }
  .carousel-track { gap: 16px; }
}

/* === FEATURES === */
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--color-surface); border-radius: var(--border-radius-lg);
  padding: 28px; border: 1px solid var(--color-border); transition: all 0.25s;
}
.feature-card:hover {
  border-color: rgba(227,30,36,0.3); transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(227,30,36,0.1);
}
.feature-icon {
  width: 44px; height: 44px; border-radius: var(--border-radius-sm);
  background: linear-gradient(135deg, var(--color-gradient-end), var(--color-gradient-start));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; margin-bottom: 18px;
}
.feature-card h3 { font-size: 1.08rem; font-weight: 600; margin-bottom: 8px; }
.feature-card p { color: var(--color-text-secondary); font-size: 0.9rem; text-align: left; line-height: 1.6; }

@media (max-width: 768px) {
  .features-grid { grid-template-columns: 1fr; }
}

/* === STATS === */
.stats-row {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; padding: 48px 0;
}
.stat-item { text-align: center; padding: 20px 12px; }
.stat-number { font-size: 2.4rem; font-weight: 700; color: var(--color-primary); margin-bottom: 6px; }
.stat-label { color: var(--color-text-secondary); font-size: 0.88rem; }
@media (max-width: 768px) { .stats-row { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .stats-row { grid-template-columns: 1fr; } .stat-number { font-size: 2rem; } }

/* === CTA === */
.cta-section {
  text-align: center; padding: 80px 24px;
  background: linear-gradient(135deg, rgba(227,30,36,0.08), rgba(183,28,28,0.06));
  border-top: 1px solid rgba(227,30,36,0.15);
  border-bottom: 1px solid rgba(227,30,36,0.15);
}
.cta-section h2 { font-size: 2rem; margin-bottom: 14px; }
.cta-section p { color: var(--color-text-secondary); margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }
@media (max-width: 480px) {
  .cta-section { padding: 60px 20px 72px; }
  .cta-section h2 { font-size: 1.5rem; }
}

/* === FOOTER === */
.footer {
  background: var(--color-bg-lighter);
  border-top: 1px solid var(--color-border);
  padding: 56px 24px 28px;
}
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 36px; }
.footer-brand { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; }
.footer-brand .accent { color: var(--color-primary); font-style: italic; }
.footer-desc { color: var(--color-text-secondary); font-size: 0.88rem; line-height: 1.6; max-width: 340px; }
.footer-col h4 {
  font-size: 0.78rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1px; color: var(--color-text-muted); margin-bottom: 16px;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--color-text-secondary); text-decoration: none; font-size: 0.88rem; transition: color 0.2s; }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid var(--color-border); padding-top: 20px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
}
.footer-bottom p { color: var(--color-text-hint); font-size: 0.82rem; }
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; padding-top: 24px; }
}

/* === PAGE HERO (inner pages) === */
.page-hero {
  padding: 56px 24px 36px; text-align: center;
  background: linear-gradient(180deg, rgba(227,30,36,0.04) 0%, transparent 100%);
  background-size: 100% 100%;
}
.page-hero h1 { font-size: 2.1rem; font-weight: 700; margin-bottom: 10px; }
.page-hero p { color: var(--color-text-secondary); font-size: 1rem; }
@media (max-width: 768px) { .page-hero h1 { font-size: 1.7rem; } }

/* === CONTENT (privacy, terms) === */
.content-container {
  max-width: 800px; margin: 0 auto; padding: 36px 24px 80px;
}
.content-container h2 {
  font-size: 1.4rem; font-weight: 600;
  margin-top: 40px; margin-bottom: 14px;
  padding-bottom: 8px; border-bottom: 1px solid var(--color-border);
}
.content-container h3 {
  font-size: 1.1rem; font-weight: 600;
  margin-top: 28px; margin-bottom: 10px;
}
.content-container p {
  color: var(--color-text-secondary); margin-bottom: 14px;
  text-align: left; line-height: 1.7;
}
.content-container ul, .content-container ol {
  color: var(--color-text-secondary); margin-bottom: 14px;
  padding-left: 24px; text-align: left;
}
.content-container li { margin-bottom: 8px; line-height: 1.6; }
.content-container a { color: var(--color-primary); text-decoration: none; word-break: break-word; }
.content-container a:hover { text-decoration: underline; }
.content-container strong { color: var(--color-text-primary); }

/* === CONTACT FORM === */
.contact-card {
  background: var(--color-surface); border-radius: var(--border-radius-lg);
  padding: 40px; border: 1px solid var(--color-border);
  max-width: 620px; margin: 0 auto;
}
.form-group { margin-bottom: 22px; }
.form-group label {
  display: block; font-size: 0.88rem; font-weight: 500;
  margin-bottom: 8px; color: var(--color-text-secondary);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%; padding: 12px 16px;
  background: var(--color-bg); border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm); color: var(--color-text-primary);
  font-family: var(--font-family); font-size: 0.92rem; transition: border-color 0.2s;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none; border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(227,30,36,0.15);
}
.form-group textarea { resize: vertical; min-height: 130px; }
.form-group input[type="file"] { padding: 10px; cursor: pointer; }
.form-group input[type="file"]::file-selector-button {
  background: var(--color-surface-alt); color: var(--color-text-primary);
  border: 1px solid var(--color-border); border-radius: var(--border-radius-sm);
  padding: 6px 16px; margin-right: 12px; cursor: pointer;
  font-family: var(--font-family); font-size: 0.82rem;
}
.form-success {
  display: none; text-align: center; padding: 40px 20px;
}
.form-success .checkmark { font-size: 3rem; margin-bottom: 14px; display: block; }
.form-success h3 { margin-bottom: 8px; font-size: 1.3rem; }
.form-success p { color: var(--color-text-secondary); }
@media (max-width: 768px) { .contact-card { padding: 24px; } }

/* === PRIVACY ACCEPT BUTTON === */
.privacy-accept-container {
  display: none; position: fixed; bottom: 0; left: 0; right: 0;
  z-index: 9999;
  background: linear-gradient(180deg, transparent, rgba(26,26,26,0.96) 40%);
  padding: 48px 24px 32px; text-align: center;
}
.privacy-accept-container.visible { display: block; }
.privacy-accept-btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 18px 72px;
  background: linear-gradient(135deg, var(--color-gradient-end), var(--color-gradient-start));
  color: #fff; font-family: var(--font-family); font-size: 1.1rem; font-weight: 700;
  border: none; border-radius: var(--border-radius); cursor: pointer;
  box-shadow: 0 8px 32px rgba(227,30,36,0.5); transition: all 0.2s;
}
.privacy-accept-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(227,30,36,0.6);
}

/* === LIGHTBOX === */
.lightbox-overlay {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  z-index: 10000; background: rgba(0,0,0,0.93);
  align-items: center; justify-content: center; padding: 24px;
}
.lightbox-overlay.active { display: flex; }
.lightbox-overlay img {
  max-width: 90vw; max-height: 85vh;
  border-radius: var(--border-radius); object-fit: contain;
}
.lightbox-close {
  position: absolute; top: 16px; right: 20px;
  background: none; border: none; color: #fff;
  font-size: 2rem; cursor: pointer; width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.2s;
}
.lightbox-close:hover { opacity: 0.7; }
.lightbox-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,0.1); border: none; color: #fff;
  width: 48px; height: 48px; border-radius: 50%;
  font-size: 1.4rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s;
}
.lightbox-nav:hover { background: rgba(255,255,255,0.2); }
.lightbox-nav.prev { left: 16px; }
.lightbox-nav.next { right: 16px; }

/* === SCROLL ANIMATIONS === */
.fade-up {
  opacity: 0; transform: translateY(24px); transition: all 0.6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* === UTILITY === */
.text-center { text-align: center; }
.text-left { text-align: left; }
.last-updated { color: var(--color-text-hint); font-size: 0.85rem; margin-top: 8px; }