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

:root {
  --bg: #0d0d0d;
  --surface: #181818;
  --surface2: #222;
  --border: #2e2e2e;
  --accent: #00d4ff;
  --accent2: #7c3aed;
  --text: #f0f0f0;
  --muted: #888;
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 12px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 16px 60px;
}

/* ── Site Nav ── */
.site-nav {
  width: 100%;
  max-width: 860px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0 28px;
  gap: 16px;
}

.site-nav .nav-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 6px;
}

.site-nav ul a {
  display: block;
  padding: 7px 18px;
  border-radius: 8px;
  font-size: .88rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color .2s, border-color .2s, background .2s;
}

.site-nav ul a:hover {
  color: var(--text);
  border-color: var(--border);
  background: var(--surface2);
}

.site-nav ul a.active {
  color: var(--accent);
  border-color: rgba(0,212,255,.35);
  background: rgba(0,212,255,.06);
}

/* ── Header ── */
header {
  text-align: center;
  margin-bottom: 40px;
}

header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--muted);
  margin-top: 8px;
  font-size: 1rem;
}

/* ── Card ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  width: 100%;
  max-width: 680px;
}

/* ── Drop Zone ── */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
}
.dropzone:hover,
.dropzone.dragover { border-color: var(--accent); background: rgba(0,212,255,.05); }
.dropzone input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}
.dropzone-icon { font-size: 2.5rem; margin-bottom: 12px; }
.dropzone p { color: var(--muted); font-size: .9rem; margin-top: 6px; }
.dropzone strong { color: var(--text); font-size: 1rem; }

#file-name {
  margin-top: 10px;
  font-size: .85rem;
  color: var(--accent);
  min-height: 1.2em;
  font-weight: 500;
}

/* ── Section label ── */
.section-title {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  margin: 24px 0 10px;
  font-weight: 600;
}

/* ── Mode toggle ── */
.mode-group {
  display: flex;
  gap: 10px;
}

.mode-btn {
  flex: 1;
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 16px 10px;
  cursor: pointer;
  text-align: center;
  transition: border-color .2s, background .2s;
  color: var(--muted);
}
.mode-btn:hover { border-color: var(--accent); color: var(--text); }
.mode-btn.active {
  border-color: var(--accent);
  background: rgba(0,212,255,.08);
  color: var(--text);
}
.mode-btn svg { display: block; margin: 0 auto 8px; }
.mode-btn span { font-size: .85rem; font-weight: 600; }

/* ── Grid options ── */
.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 480px) { .options-grid { grid-template-columns: 1fr; } }

.opt-group label {
  display: block;
  font-size: .8rem;
  color: var(--muted);
  margin-bottom: 6px;
  font-weight: 500;
}

select, input[type="number"] {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 9px 12px;
  font-size: .9rem;
  outline: none;
  appearance: none;
  transition: border-color .2s;
}
select:focus, input[type="number"]:focus { border-color: var(--accent); }

/* ── Color pickers ── */
.color-row {
  display: flex;
  gap: 14px;
}
.color-field {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  transition: border-color .2s;
}
.color-field:focus-within { border-color: var(--accent); }
.color-field input[type="color"] {
  width: 32px; height: 32px;
  border: none; background: none;
  cursor: pointer; padding: 0;
  border-radius: 4px;
}
.color-field input[type="text"] {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: .9rem;
  font-family: 'Courier New', monospace;
  outline: none;
  width: 80px;
}
.color-field label { font-size: .78rem; color: var(--muted); }

/* ── Scale toggle ── */
.scale-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.scale-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 14px;
  font-size: .82rem;
  color: var(--muted);
  cursor: pointer;
  transition: border-color .2s, color .2s;
}
.scale-btn:hover { border-color: var(--accent); color: var(--text); }
.scale-btn.active { border-color: var(--accent); color: var(--accent); font-weight: 600; }

/* ── Submit button ── */
.btn-submit {
  width: 100%;
  margin-top: 28px;
  padding: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: 10px;
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity .2s, transform .1s;
  letter-spacing: .03em;
}
.btn-submit:hover { opacity: .9; }
.btn-submit:active { transform: scale(.99); }
.btn-submit:disabled { opacity: .5; cursor: not-allowed; }

/* ── Status / Result ── */
#status-box {
  display: none;
  margin-top: 20px;
  padding: 16px 20px;
  border-radius: var(--radius);
  font-size: .9rem;
  line-height: 1.6;
}
#status-box.info    { background: rgba(0,212,255,.08); border: 1px solid rgba(0,212,255,.3); color: var(--accent); }
#status-box.error   { background: rgba(239,68,68,.08); border: 1px solid rgba(239,68,68,.3); color: var(--danger); }
#status-box.success { background: rgba(34,197,94,.08);  border: 1px solid rgba(34,197,94,.3);  color: var(--success); }

/* ── Spinner ── */
.spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Progress bar ── */
.progress-wrap {
  display: none;
  margin-top: 12px;
  background: var(--surface2);
  border-radius: 100px;
  height: 6px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  width: 0%;
  transition: width .3s;
  border-radius: 100px;
}

/* ── Download button ── */
.btn-download {
  display: none;
  margin-top: 16px;
  width: 100%;
  padding: 13px;
  background: rgba(34,197,94,.12);
  border: 1px solid rgba(34,197,94,.4);
  border-radius: 10px;
  color: var(--success);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background .2s;
}
.btn-download:hover { background: rgba(34,197,94,.22); }

/* ── Video Preview ── */
.preview-wrap {
  display: none;
  margin-top: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
}

.preview-label {
  padding: 8px 14px;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  font-weight: 600;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}

.preview-wrap video {
  display: block;
  width: 100%;
  max-height: 360px;
  background: #000;
}

/* ── Features Section ── */
.features-section {
  width: 100%;
  max-width: 860px;
  margin-top: 56px;
  text-align: center;
}

.features-title {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 10px;
}

.features-subtitle {
  color: var(--muted);
  font-size: .95rem;
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.65;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  text-align: left;
}

@media (max-width: 720px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .features-grid { grid-template-columns: 1fr; } }

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: border-color .2s, transform .2s;
}
.feature-card:hover {
  border-color: rgba(0,212,255,.4);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.7rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: .85rem;
  color: #aaa;
  line-height: 1.65;
}

/* ── Blog List ── */
.blog-list-wrap {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.blog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: border-color .2s;
}
.blog-card:hover { border-color: rgba(0,212,255,.4); }

.blog-tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--accent);
  background: rgba(0,212,255,.08);
  border: 1px solid rgba(0,212,255,.25);
  border-radius: 4px;
  padding: 2px 8px;
  margin-bottom: 10px;
}

.blog-card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 4px;
}
.blog-card h2 a {
  color: var(--text);
  text-decoration: none;
  transition: color .2s;
}
.blog-card h2 a:hover { color: var(--accent); }

.blog-meta, .blog-date {
  font-size: .78rem;
  color: var(--muted);
  margin-bottom: 10px;
}

.blog-excerpt {
  font-size: .9rem;
  color: #bbb;
  line-height: 1.6;
  margin-bottom: 14px;
}

.blog-read-more {
  font-size: .85rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  transition: opacity .2s;
}
.blog-read-more:hover { opacity: .75; }

/* ── Blog Article ── */
.blog-article {
  width: 100%;
  max-width: 680px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
}
@media (max-width: 520px) { .blog-article { padding: 24px 18px; } }

.blog-article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.blog-article-title {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--text);
}

.blog-article h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  margin: 32px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.blog-article h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  margin: 20px 0 6px;
}

.blog-article p {
  font-size: .95rem;
  color: #ccc;
  line-height: 1.75;
  margin-bottom: 14px;
}

.blog-article ul,
.blog-article ol {
  padding-left: 22px;
  margin-bottom: 14px;
}

.blog-article li {
  font-size: .95rem;
  color: #ccc;
  line-height: 1.75;
  margin-bottom: 4px;
}

.blog-article a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.blog-article pre {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  margin-bottom: 16px;
}
.blog-article code {
  font-family: 'Courier New', monospace;
  font-size: .85rem;
  color: var(--accent);
}
.blog-article pre code { color: #e0e0e0; }

.blog-cta-p { margin-top: 24px; }
.blog-cta-btn {
  display: inline-block;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 10px;
  color: #fff !important;
  font-weight: 700;
  font-size: .95rem;
  text-decoration: none !important;
  transition: opacity .2s;
}
.blog-cta-btn:hover { opacity: .88; }

.blog-back {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.blog-back a {
  font-size: .88rem;
  color: var(--muted) !important;
  text-decoration: none !important;
  transition: color .2s;
}
.blog-back a:hover { color: var(--text) !important; }

/* ── Footer ── */
footer {
  margin-top: 48px;
  color: var(--muted);
  font-size: .8rem;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin-bottom: 10px;
}

.footer-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: .8rem;
  transition: color .2s;
}
.footer-nav a:hover { color: var(--text); }