:root {
  --bg: #0b0e14;
  --bg-elevated: #12161f;
  --bg-card: #161b26;
  --border: #1e2533;
  --text: #e6edf7;
  --text-muted: #8b9bb4;
  --accent: #7c5cff;
  --accent-hover: #9480ff;
  --accent-dim: rgba(124, 92, 255, 0.15);
  --success: #3dd68c;
  --danger: #ff6b6b;
  --radius: 12px;
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #7c5cff, #4a9eff);
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  color: white;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  font-size: 0.925rem;
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--accent-dim);
}

.nav-links a.active {
  color: var(--accent);
}

/* Main */
main {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 0 3.5rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero h1 span {
  background: linear-gradient(135deg, #7c5cff, #4a9eff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.15rem;
  max-width: 540px;
  margin: 0 auto 2rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: white;
}

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

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Cards / sections */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card p {
  color: var(--text-muted);
  font-size: 0.925rem;
}

.card .icon {
  font-size: 1.25rem;
}

/* About content */
.prose {
  max-width: 680px;
}

.prose p {
  color: var(--text-muted);
  margin-bottom: 1.1rem;
}

.prose h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2rem 0 0.85rem;
  letter-spacing: -0.02em;
}

.prose ul {
  color: var(--text-muted);
  padding-left: 1.35rem;
  margin-bottom: 1.1rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--bg-elevated);
  padding: 0.15em 0.4em;
  border-radius: 5px;
  color: var(--accent);
}

/* Contact */
.contact-form {
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.15s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* Download */
.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 560px;
}

.download-card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.download-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  font-family: var(--mono);
}

.download-status {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  min-height: 1.4em;
}

.download-status.error {
  color: var(--danger);
}

.download-status.success {
  color: var(--success);
}

/* Admin */
.admin-panel {
  max-width: 560px;
}

.admin-panel .card {
  margin-bottom: 1.5rem;
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.upload-zone input[type="file"] {
  display: none;
}

.upload-zone p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.progress-bar {
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 1rem;
  display: none;
}

.progress-bar.visible {
  display: block;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.2s ease;
}

.admin-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--text-muted);
}

footer a:hover {
  color: var(--accent);
}

/* Mobile nav */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

@media (max-width: 640px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0.75rem;
  }

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

  .nav-links a {
    padding: 0.75rem 1rem;
  }
}