:root {
  --bg-color: #0f0f13;
  --card-bg: #1a1a1f;
  --text-main: #eeeeee;
  --text-muted: #9ba1a6;
  --primary: #00d4ff;
  --primary-hover: #00b8d4;
  --accent: #ff007a;
  --border: #333333;
  --max-width: 77.7rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 1.125rem;
}

section {
  scroll-margin-top: 4rem;
}

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

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

nav ul {
  list-style: none;
}

ol li {
  text-align: left;
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

ol li::marker {
  color: var(--primary);
}

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

/* UTILITY */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.highlight {
  color: var(--primary);
}

.text-link {
  color: var(--primary);
  text-decoration: underline;
}

.text-link:hover {
  color: #fff;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.8rem;
  border-radius: 6px;
  font-weight: 700;
  cursor: pointer;
  gap: 0.6rem;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.03rem;
  text-align: center;
}

.btn-primary {
  background: var(--primary);
  color: #050505;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  border: 2px solid var(--text-muted);
  color: var(--text-main);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* STRIP SECTIONS */
.section-strip {
  width: 100%;
  background-color: #e1e1e6;
  color: #0f0f13;
  padding: 2.5rem 0;
  box-shadow: 0 0 1.1rem rgba(0, 0, 0, 0.5);
  text-align: center;
  margin-bottom: 2rem;
}

.hero-strip .txt-rotate > .wrap {
  color: #009ebf;
  border-right-color: #009ebf;
}

.hero-strip .hero-title {
  color: #0f0f13;
  margin-bottom: 0;
}

/* HEADER */
.site-header {
  padding: 1rem 0;
  background: rgba(15, 15, 19, 0.95);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.logo-area {
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 1rem;
  letter-spacing: -0.03rem;
  flex-wrap: wrap;
}

.badge {
  background: #252525;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  color: var(--primary);
  font-family: monospace;
  font-weight: bold;
  font-size: 0.85rem;
  white-space: nowrap;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.8rem;
  cursor: pointer;
  padding: 0 0.5rem;
  margin-left: auto;
}

.main-nav ul {
  display: flex;
  gap: 2rem;
  align-items: center;
  font-weight: 600;
  margin-left: 2rem;
}

.main-nav a:hover {
  color: var(--primary);
}

.lang-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.lang-toggle:hover {
  border-color: var(--text-main);
  color: var(--text-main);
}

.lang-toggle .active {
  color: var(--primary);
}

.lang-toggle .sep {
  opacity: 0.5;
}

/* HERO */
.hero {
  padding: 0;
  text-align: center;
}

.hero-brand-area {
  padding-top: 2rem !important;
  padding-bottom: 2rem !important;
}

.hero-content {
  padding-bottom: 3rem;
}

.hero-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.brand-logo {
  width: 15rem;
  height: 15rem;
  color: var(--primary);
}

.logo-svg {
  width: 100%;
  height: 100%;
  display: block;
}

.brand-breakdown {
  font-size: 2.5rem;
  font-weight: 500;
  color: #fff;
  opacity: 0.9;
  letter-spacing: 0.03rem;
  line-height: 1.2;
}

.brand-breakdown span {
  font-weight: 800;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.2;
  margin-bottom: 1.5rem;
  font-weight: 800;
}

.txt-rotate > .wrap {
  border-right: 0.1em solid var(--primary);
  color: var(--primary);
  animation: blink 0.7s infinite;
}

@keyframes blink {
  from, to {
    border-color: transparent
  }
  50% {
    border-color: var(--primary)
  }
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--text-main);
  max-width: 67rem;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.app-showcase {
  border-radius: 0;
  overflow: hidden;
  box-shadow: 0 0 2.2rem rgba(0, 212, 255, 0.1);
  border: 1px solid var(--border);
  margin: 0 auto;
  max-width: 100%;
  width: fit-content;
}

.screenshot-caption {
  font-size: 0.8rem;
  font-style: italic;
  color: #888;
  text-align: center;
  margin: 0 auto 2rem;
}

/* HOW IT WORKS */
.section-workflow {
  padding: 4rem 0;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.workflow-header {
  text-align: center;
  margin-bottom: 4rem;
  max-width: 50rem;
  margin-left: auto;
  margin-right: auto;
}

.workflow-header h2 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.workflow-header p {
  color: var(--text-main);
  font-size: 1.2rem;
  text-align: left;
  margin-bottom: 0.5rem;
}

.workflow-row {
  display: flex;
  align-items: center;
  gap: 4rem;
  margin-bottom: 5rem;
}

.workflow-row:last-child {
  margin-bottom: 0;
}

/* Odd rows: media left, text right */
.workflow-row:nth-child(odd) {
  flex-direction: row-reverse;
}

.workflow-text {
  flex: 1;
}

.workflow-media {
  flex: 1.2;
}

.workflow-icon {
  font-size: 2.5rem;
}

.workflow-title {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.workflow-text h3 {
  font-size: 2rem;
  line-height: 1.2;
  color: var(--primary);
}

.workflow-text p {
  color: var(--text-main);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

/* MEDIA */
.media-wrapper {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.4);
  background: #151515;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  aspect-ratio: 3 / 2;
  position: relative;
}

.feature-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.media-wrapper:hover {
  border-color: var(--primary);
}

.media-wrapper:hover .feature-img {
  transform: scale(1.03);
}

/* DOWNLOAD */
.section-download {
  padding-bottom: 3rem;
  padding-top: 3rem;
  text-align: center;
  background: linear-gradient(to bottom, var(--bg-color), #050505);
}

.download-inner h2 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.download-sub {
  color: var(--text-muted);
  margin-bottom: 3rem;
}

.download-box {
  margin: 0 auto;
  padding: 3rem;
  background: var(--card-bg);
  max-width: 38rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  text-align: left;
}

.os-section {
  text-align: center;
}

.os-section h3 {
  margin-bottom: 1rem;
  font-size: 1.4rem;
}

.version-info, .version-number {
  display: block;
  margin-top: 0.5rem;
  text-align: center;
}

.version-info {
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.9rem;
}

.version-number {
  font-weight: bold;
  font-size: 1.25rem;
}

.btn-large {
  background: var(--primary);
  color: #000;
  padding: 1.2rem;
  font-size: 1.2rem;
  border-radius: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  width: 100%;
}

.btn-large:hover {
  background: var(--primary-hover);
}

.divider {
  border: 0;
  height: 1px;
  background: var(--border);
  margin: 2rem 0;
}

.security-note {
  margin-top: 12px;
  background-color: #f0f7ff;
  border: 1px solid #cce5ff;
  border-radius: 6px;
  padding: 1rem;
  display: flex;
  gap: 1rem;
  text-align: left;
  font-size: 0.85rem;
  color: #333;
}

.note-icon {
  font-size: 1.2rem;
}

.note-text a {
  color: #0066cc;
  text-decoration: underline;
  cursor: pointer;
  font-weight: 500;
  display: inline-block;
  margin-top: 1rem;
}

/* FAQ */
.section-faq {
  padding: 3rem 0;
  max-width: 50rem;
  margin: 0 auto;
}

.section-faq h2 {
  margin-bottom: 3rem;
  text-align: center;
  font-size: 2rem;
}

details {
  background: var(--card-bg);
  margin-bottom: 1.2rem;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid transparent;
}

details[open] {
  border-color: var(--border);
}

summary {
  padding: 1.5rem;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.1rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--primary);
}

details[open] summary::after {
  content: '−';
}

details p {
  padding: 0 1.5rem 1.5rem 1.5rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Highlight effect for the targetted FAQ item */
details:target {
  animation: highlight 2s ease-out;
  border: 1px solid var(--primary);
  border-radius: 4px;
}

@keyframes highlight {
  0% {
    background-color: rgba(0, 173, 181, 0.3);
  }
  100% {
    background-color: transparent;
  }
}

/* ANKI MANUAL */
.section-anki {
  padding: 2rem 0 1rem;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
}

.section-anki ul {
  padding-left: 1.25rem;
}

.anki-header {
  text-align: center;
  margin-bottom: 4rem;
  max-width: 80rem;
  margin-left: auto;
  margin-right: auto;
}

.anki-header h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.anki-header p {
  color: var(--text-main);
  font-size: 1.2rem;
  text-align: left;
  margin-bottom: 0.5rem;
}

/* FOOTER */
footer {
  padding: 1rem 0;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}

footer a:hover {
  color: var(--primary) !important;
  text-decoration: underline;
}

@media (max-width: 63rem) {
  html {
    font-size: 1rem;
  }

  ol, ul {
    padding-left: 1.25rem;
  }

  /* Reset zig-zag on tablet/mobile */
  .workflow-row,
  .workflow-row:nth-child(odd) {
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 2rem;
  }

  .workflow-text {
    width: 100%;
  }

  .workflow-media {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  /* Hamburger Menu */
  .mobile-menu-btn {
    display: block;
    font-size: 1.5rem;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(15, 15, 19, 0.98);
    max-height: 0;
    overflow: hidden;
    box-shadow: 0 1rem 1rem rgba(0, 0, 0, 0.5);
  }

  .main-nav.active {
    max-height: 25rem;
  }

  .main-nav ul {
    flex-direction: column;
    margin: 0;
    padding: 1rem 0;
    gap: 0;
  }

  .main-nav li {
    width: 100%;
    margin: 0;
  }

  .main-nav a {
    display: block;
    padding: 1rem;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .lang-item {
    display: flex;
    justify-content: center;
    padding: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }
}

@media (max-width: 28rem) {
  .container {
    padding: 0 1rem;
  }

  .logo-area {
    flex: 1;
    gap: 0.5rem;
  }

  .badge {
    margin-top: 0.2rem;
  }

  .download-box {
    padding: 1.5rem;
  }

  .btn-large {
    flex-direction: column;
    text-align: center;
    font-size: 1rem;
    padding: 1rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .footer-break {
    display: block;
    margin-top: 0.3rem;
  }

  .brand-breakdown {
    font-size: 1.8rem;
  }

  .hero-title {
    font-size: 2rem;
  }
}