@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&display=swap');

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

:root {
  --bg: #0f0f13;
  --card: #1a1a2e;
  --card-hover: #222240;
  --border: #2a2a3e;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent-1: #10b981;
  --accent-2: #059669;
  --accent-3: #047857;
  --gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
  --gradient-text: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
  --font: 'Inter', sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

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;
  -webkit-font-smoothing: antialiased;
}

/* ── Nav ── */
nav {
  background: rgba(15,15,19,.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.logo-icon { font-size: 1.5rem; }
.logo:hover { color: var(--accent-1); }

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.4rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-links {
  list-style: none;
  display: flex;
  gap: 8px;
}
.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: .92rem;
  font-weight: 500;
  transition: color .2s, background .2s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-1);
  background: rgba(16,185,129,.08);
}

/* ── Container ── */
.container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 60px 0 30px;
}
.hero h1 { font-size: 2.8rem; font-weight: 800; margin-bottom: 12px; }
.hero p { color: var(--text-muted); font-size: 1.12rem; max-width: 560px; margin: 0 auto; }
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Ad Slot ── */
.ad-slot {
  background: var(--card);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  text-align: center;
  color: var(--text-muted);
  font-size: .85rem;
  margin: 24px 0;
}

/* ── Tool Card ── */
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

/* ── Upload Area ── */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color .25s, background .25s;
  position: relative;
}
.upload-area:hover,
.upload-area.dragover {
  border-color: var(--accent-1);
  background: rgba(16,185,129,.04);
}
.upload-area .upload-icon { font-size: 3rem; margin-bottom: 12px; }
.upload-area p { color: var(--text-muted); margin-bottom: 4px; }
.upload-hint { font-size: .82rem !important; color: var(--text-muted) !important; opacity: .7; }
.upload-area input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

/* ── File Info ── */
.file-info {
  display: none;
  align-items: center;
  gap: 14px;
  background: rgba(16,185,129,.06);
  border: 1px solid rgba(16,185,129,.18);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 20px;
}
.file-info.show { display: flex; }
.file-icon { font-size: 1.6rem; }
.file-details { flex: 1; min-width: 0; }
.file-name { font-weight: 600; font-size: .95rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-size { color: var(--text-muted); font-size: .82rem; }
.file-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 50%;
  transition: color .2s, background .2s;
}
.file-remove:hover { color: #f87171; background: rgba(248,113,113,.1); }

/* ── Options ── */
.options-row {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.option-group {
  flex: 1;
  min-width: 140px;
}
.option-group label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.option-group select {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: .95rem;
  cursor: pointer;
  transition: border-color .2s;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}
.option-group select:focus {
  outline: none;
  border-color: var(--accent-1);
}

/* ── Buttons ── */
.btn {
  display: block;
  width: 100%;
  padding: 14px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s, transform .15s;
}
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn:active:not(:disabled) { transform: scale(.985); }

.btn-primary {
  background: var(--gradient);
  color: #fff;
  margin-bottom: 16px;
}
.btn-primary:hover:not(:disabled) { opacity: .9; }

/* ── Progress Bar ── */
.progress-bar {
  display: none;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 16px;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--gradient);
  border-radius: 3px;
  transition: width .4s ease;
}

/* ── Status Message ── */
.status-msg {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: .92rem;
  font-weight: 500;
  margin-bottom: 16px;
}
.status-msg.show { display: flex; }
.status-msg.loading { background: rgba(16,185,129,.08); color: var(--accent-1); }
.status-msg.success { background: rgba(16,185,129,.12); color: #34d399; }
.status-msg.error { background: rgba(248,113,113,.1); color: #f87171; }

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(16,185,129,.25);
  border-top-color: var(--accent-1);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Result Area ── */
.result-area {
  display: none;
  margin-top: 8px;
}
.result-area.show { display: block; }
.result-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}
.result-preview {
  max-width: 100%;
  max-height: 400px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,.3);
}
.result-info {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 18px;
}
.result-info span {
  background: var(--card);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  color: var(--text-muted);
  font-family: var(--mono);
  border: 1px solid var(--border);
}
.btn-download {
  display: inline-block;
  padding: 12px 32px;
  background: var(--gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s, transform .15s;
}
.btn-download:hover { opacity: .9; }
.btn-download:active { transform: scale(.985); }

/* ── How-To ── */
.how-to {
  padding: 50px 0 30px;
  text-align: center;
}
.how-to h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 32px;
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  transition: border-color .25s, transform .2s;
}
.step:hover { border-color: var(--accent-1); transform: translateY(-3px); }
.step-number {
  width: 40px;
  height: 40px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  margin: 0 auto 14px;
}
.step h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.step p { color: var(--text-muted); font-size: .88rem; }

/* ── Features ── */
.features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 20px 0 50px;
}
.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 18px;
  text-align: center;
  transition: border-color .25s, transform .2s;
}
.feature:hover { border-color: var(--accent-1); transform: translateY(-3px); }
.feature-icon { font-size: 2rem; margin-bottom: 12px; display: block; }
.feature h3 { font-size: .95rem; font-weight: 700; margin-bottom: 6px; }
.feature p { color: var(--text-muted); font-size: .82rem; }

/* ── FAQ ── */
.faq {
  padding: 20px 0 50px;
}
.faq h2 {
  font-size: 1.6rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 28px;
}
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
}
.faq-q {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: .95rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: color .2s;
  user-select: none;
}
.faq-q::after {
  content: '\276F';
  font-size: .85rem;
  color: var(--text-muted);
  transition: transform .25s;
  flex-shrink: 0;
  margin-left: 12px;
}
.faq-item.open .faq-q { color: var(--accent-1); }
.faq-item.open .faq-q::after { transform: rotate(90deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease, padding .3s ease;
}
.faq-item.open .faq-a {
  max-height: 200px;
  padding: 0 20px 16px;
}
.faq-a p { color: var(--text-muted); font-size: .9rem; line-height: 1.7; }

/* ── Footer ── */
footer {
  margin-top: auto;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 20px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copy { color: var(--text-muted); font-size: .82rem; }
.footer-links {
  list-style: none;
  display: flex;
  gap: 20px;
}
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: .82rem;
  transition: color .2s;
}
.footer-links a:hover { color: var(--accent-1); }

/* ── Content Page ── */
.content-page {
  padding: 50px 0;
}
.content-page h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 24px;
}
.content-page h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--accent-1);
}
.content-page p {
  color: var(--text-muted);
  font-size: .95rem;
  line-height: 1.8;
  margin-bottom: 14px;
}
.content-page ul {
  color: var(--text-muted);
  font-size: .95rem;
  line-height: 1.8;
  margin-bottom: 14px;
  padding-left: 24px;
}
.content-page a { color: var(--accent-1); text-decoration: underline; }
.content-page a:hover { color: var(--accent-2); }

.contact-form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-top: 24px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: .88rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-muted);
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: .95rem;
  transition: border-color .2s;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(15,15,19,.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 20px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 14px; }
  nav .container { position: relative; }

  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }

  .tool-card { padding: 22px; }

  .steps { grid-template-columns: 1fr; gap: 14px; }
  .features { grid-template-columns: repeat(2, 1fr); gap: 14px; }
}

@media (max-width: 480px) {
  .hero { padding: 40px 0 20px; }
  .hero h1 { font-size: 1.65rem; }

  .tool-card { padding: 16px; }
  .upload-area { padding: 32px 16px; }

  .options-row { flex-direction: column; gap: 12px; }

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

  .result-info { flex-direction: column; align-items: center; }

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