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

:root {
  --accent: #00acec;
  --accent-light: #ffffff;
  --accent-dark: #00acec;
  --bg: #0d0d14;
  --bg-alt: #12121e;
  --card-bg: #1a1a2e;
  --border: #2a2a42;
  --text: #00acec;
  --text-muted: #cbd0d2;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== Typography ===== */
h1,
h2,
h3 {
  line-height: 1.2;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 1rem;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Layout ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-alt {
  background: var(--bg-alt);
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(13, 13, 20, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.0rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--text);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo-img {
  height: 32px;
  width: auto;
  display: block;
}

.nav-logo span {
  color: var(--accent-light);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 0.25rem;
  /* Desktop: sit beside the navbar by overlapping it */
  position: fixed;
  top: 0;
  right: 1.5rem;
  height: 60px;
  align-items: center;
  z-index: 100;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.92rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--accent-light);
  color: var(--accent-light);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem 1.5rem 4rem;
  max-width: 100%;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 560px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
  flex: 1;
  min-width: 0;
}

.hero-content h1 {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 900;
  letter-spacing: -2px;
  margin-bottom: 0.75rem;
}

.hero-content h1 span {
  color: var(--accent-light);
}

.hero-tagline {
  font-size: 1.2rem;
  color: var(--accent-light);
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 480px;
  margin-bottom: 2rem;
}

.hero-content .btn+.btn {
  margin-left: 0.75rem;
}

.hero-visual {
  position: absolute;
  top: 0;
  right: 0;
  width: 70%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
  mask-image: linear-gradient(to right, transparent 0%, black 0%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 20%);
}

/* ===== Download ===== */
.video-embed {
  position: relative;
  width: 100%;
  max-width: 720px;
  margin: 2rem auto 0;
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  background: #000;
}

.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.download-banners {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  flex-wrap: wrap;
  align-items: center;
}

.download-banner-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.download-banner-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent-light);
}

.download-banner-link {
  display: inline-block;
  transition: transform var(--transition), opacity var(--transition);
}

.download-banner-link:hover {
  transform: translateY(-3px);
  opacity: 0.85;
}

.download-banner-link img {
  height: 52px;
  width: auto;
  display: block;
}


/* ===== Gallery / Screenshots ===== */
.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  justify-items: center;
}

@media (max-width: 640px) {
  .screenshots-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
  }
}

.screenshot-thumb {
  background: none;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  padding: 0;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  width: 100%;
}

.screenshot-thumb:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(124, 58, 237, 0.25);
}

.screenshot-thumb img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.gallery-subtitle {
  text-align: center;
  font-size: clamp(1.3rem, 2.5vw, 1.6rem);
  font-weight: 700;
  margin: 3rem 0 1.25rem;
  color: var(--accent-light);
}

.visualizations-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

@media (max-width: 640px) {
  .visualizations-grid {
    gap: 0.5rem;
  }
}

.visualization-thumb {
  background: none;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  padding: 0;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  width: 100%;
  aspect-ratio: 1 / 1;
}

.visualization-thumb:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(124, 58, 237, 0.25);
}

.visualization-thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== Lightbox ===== */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
}

.lightbox.open {
  display: flex;
}

.lightbox-img-wrap {
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-img-wrap img {
  max-width: 100%;
  max-height: 90vh;
  border-radius: var(--radius);
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.8);
  object-fit: contain;
  user-select: none;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: fixed;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  cursor: pointer;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  transition: background var(--transition);
  line-height: 1;
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  background: rgba(124, 58, 237, 0.5);
}

.lightbox-close {
  top: 1.25rem;
  right: 1.25rem;
  font-size: 1.6rem;
}

.lightbox-prev {
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-next {
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
}

/* ===== Features ===== */
.feature-tags {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto 1.5rem;
}

.feature-tag {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  text-align: left;
  transition: border-color var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.feature-tag:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.feature-tag-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.feature-tag-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  fill: var(--accent);
}

.feature-tag-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
}

.feature-tag-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

@media (max-width: 640px) {
  .feature-tags {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}

.features-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.features-list li {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.features-list li::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 0.35em;
}

@media (max-width: 640px) {
  .features-box {
    grid-template-columns: 1fr;
    padding: 1.5rem;
    gap: 0.6rem;
  }
}

/* ===== Donate ===== */
.donate-container {
  text-align: center;
}

.donate-container img {
  max-width: 100%;
  height: auto;
}

.donate-buttons {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.donate-container .donate-btn-img {
  height: 64px;
  width: auto;
  max-width: none;
}

.donate-container .donate-btn-paypal {
  height: 104px;
}

.donate-qr {
  max-width: 220px;
}

/* ===== Partnership ===== */
.partnership-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  max-width: 760px;
  margin: 0 auto;
  color: var(--text-muted);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  font-size: 1.02rem;
}

.partnership-cta {
  margin-top: 0.5rem;
  color: var(--accent-light);
  font-weight: 600;
}

.partnership-email {
  display: inline-block;
  margin-top: 0.4rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
  transition: color var(--transition);
}

.partnership-email:hover {
  color: var(--accent-light);
}

.partnership-waves {
  display: block;
  width: 100%;
  height: 100px;
  margin-top: -3.5rem;
  margin-bottom: -1rem;
}

@media (max-width: 640px) {
  .partnership-box {
    padding: 1.5rem 1.25rem;
    font-size: 0.97rem;
  }
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item.open {
  border-color: var(--accent);
}

.faq-question {
  width: 100%;
  background: var(--card-bg);
  border: none;
  padding: 1.1rem 1.25rem;
  text-align: left;
  color: var(--accent-light);
  font-size: 0.97rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: background var(--transition);
}

.faq-question:hover {
  background: rgba(255, 255, 255, 0.04);
}

.faq-icon {
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--accent);
  transition: transform var(--transition);
  flex-shrink: 0;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.25s ease;
}

.faq-answer.open {
  max-height: 600px;
}

.faq-answer p,
.faq-answer ul {
  padding: 1rem 1.25rem 1.1rem;
  color: var(--text-muted);
  font-size: 0.93rem;
  border-top: 1px solid var(--border);
}

.faq-answer ul {
  padding-left: 2.5rem;
}

.faq-answer li {
  margin-bottom: 0.4rem;
}

.faq-answer li:last-child {
  margin-bottom: 0;
}

.faq-answer code {
  background: rgba(124, 58, 237, 0.15);
  color: var(--accent-light);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  font-size: 0.88em;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

/* ===== Contact Info ===== */
.contact-info {
  list-style: none;
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.contact-info li {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1.1rem 1.5rem;
  background: var(--card-bg);
}

.contact-info li+li {
  border-top: 1px solid var(--border);
}

.contact-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-light);
  min-width: 70px;
  flex-shrink: 0;
}

.contact-value {
  font-size: 0.97rem;
  color: var(--text);
}

.contact-link {
  text-decoration: none;
  color: var(--text);
  transition: color var(--transition);
}

.contact-link:hover {
  color: var(--accent-light);
  text-decoration: underline;
}

/* ===== Social ===== */
.social-section {
  padding: 3rem 0;
}

.social-links {
  list-style: none;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  transition: transform var(--transition), opacity var(--transition);
}

.social-link:hover {
  transform: translateY(-3px);
  opacity: 0.85;
}

.social-link img {
  width: 48px;
  height: 48px;
  display: block;
}

.social-link img.social-icon-kofi {
  width: 48px;
  height: 38px;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  text-align: center;
}

.footer-logo {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.footer-logo span {
  color: var(--accent-light);
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.87rem;
}

.footer-links {
  margin-top: 0.75rem;
  font-size: 0.87rem;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--accent-light);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero {
    flex-direction: column;
    text-align: center;
    gap: 3rem;
    padding-top: 7rem;
  }

  .hero-visual {
    width: 100%;
    opacity: 0.5;
  }

  .hero-video {
    mask-image: linear-gradient(to bottom, transparent 0%, black 30%, black 70%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 30%, black 70%, transparent 100%);
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    height: auto;
    background: rgba(13, 13, 20, 0.98);
    backdrop-filter: blur(16px);
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    z-index: 101;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.3rem;
    padding: 0.75rem 2rem;
  }

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

@media (max-width: 480px) {
  .section {
    padding: 3.5rem 0;
  }

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

  .download-cards {
    flex-direction: column;
    align-items: center;
  }

  .donate-options {
    flex-direction: column;
    align-items: center;
  }
}

/* ===== Scroll reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}