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

:root {
  --bg: #0a0a0f;
  --bg2: #12121a;
  --bg3: #1a1a26;
  --accent: #6c63ff;
  --accent2: #ff6584;
  --text: #e8e8f0;
  --text2: #8888aa;
  --border: #2a2a3a;
  --success: #4ade80;
  --danger: #f87171;
  --radius: 16px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
}

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

/* ===== ADS ===== */
.ad-header, .ad-footer {
  width: 100%;
  max-width: 728px;
  margin: 12px auto;
  min-height: 90px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.ad-sidebar {
  width: 300px;
  flex-shrink: 0;
}

.ad-label {
  font-size: 10px;
  color: var(--text2);
  text-align: center;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===== HEADER ===== */
header {
  text-align: center;
  padding: 40px 20px 20px;
}

.logo {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -1px;
}

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

.tagline {
  color: var(--text2);
  font-size: 0.95rem;
  margin-top: 8px;
}

/* ===== MAIN ===== */
main {
  width: 100%;
  max-width: 860px;
  padding: 20px;
  flex: 1;
}

/* ===== STEPS ===== */
.step {
  display: none;
  animation: fadeIn 0.3s ease;
}

.step.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== UPLOAD ZONE ===== */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 40px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg2);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(108, 99, 255, 0.05);
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.6;
}

.upload-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.upload-sub {
  color: var(--text2);
  font-size: 0.9rem;
}

.supported-formats {
  margin-top: 24px;
  font-size: 0.78rem;
  color: var(--text2);
  letter-spacing: 0.5px;
}

/* ===== FILE PREVIEW ===== */
.file-preview {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-top: 16px;
}

#fileName {
  flex: 1;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#fileSize {
  color: var(--text2);
  font-size: 0.85rem;
  flex-shrink: 0;
}

#removeFile {
  background: none;
  border: none;
  color: var(--text2);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0 4px;
  transition: color 0.2s;
}

#removeFile:hover { color: var(--danger); }

/* ===== FORMAT SELECTOR ===== */
.format-selector {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.format-selector label {
  color: var(--text2);
  font-size: 0.9rem;
}

.format-selector select {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 0.95rem;
  cursor: pointer;
  flex: 1;
}

/* ===== BUTTONS ===== */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-primary:hover {
  background: #5a52e0;
  transform: translateY(-1px);
}

.btn-download {
  background: var(--success);
  color: #000;
  border: none;
  padding: 16px 48px;
  border-radius: 12px;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin: 16px 0;
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(74, 222, 128, 0.3);
}

.btn-download:disabled {
  background: var(--border);
  color: var(--text2);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: transparent;
  color: var(--text2);
  border: 1px solid var(--border);
  padding: 10px 24px;
  border-radius: 10px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 12px;
}

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

/* ===== CONVERTING ===== */
#step-converting {
  text-align: center;
  padding: 80px 20px;
}

.spinner {
  width: 56px;
  height: 56px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 24px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.converting-sub {
  color: var(--text2);
  font-size: 0.85rem;
  margin-top: 8px;
}

/* ===== DOWNLOAD + COUNTDOWN ===== */
.download-container {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.download-main {
  flex: 1;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  box-shadow: var(--shadow);
}

.success-icon {
  width: 64px;
  height: 64px;
  background: rgba(74, 222, 128, 0.15);
  color: var(--success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto 16px;
}

.download-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.download-hint {
  color: var(--text2);
  font-size: 0.88rem;
  margin-top: 8px;
}

/* ===== COUNTDOWN SVG ===== */
.countdown-wrap {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 20px auto;
}

.countdown-svg {
  width: 120px;
  height: 120px;
  transform: rotate(-90deg);
}

.countdown-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 6;
}

.countdown-ring {
  fill: none;
  stroke: var(--accent);
  stroke-width: 6;
  stroke-linecap: round;
  stroke-dasharray: 339.3;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear, stroke 0.5s;
}

.countdown-number {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

/* ===== EXPIRED ===== */
#step-expired {
  text-align: center;
  padding: 80px 20px;
}

.expired-icon {
  font-size: 4rem;
  margin-bottom: 24px;
}

#step-expired h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
  color: var(--danger);
}

#step-expired p {
  color: var(--text2);
  margin-bottom: 8px;
}

.expired-sub {
  font-size: 0.85rem;
  margin-bottom: 32px !important;
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 24px 20px;
  color: var(--text2);
  font-size: 0.82rem;
}

footer a {
  color: var(--text2);
  text-decoration: none;
}

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

.footer-promise {
  margin-top: 8px;
  font-size: 0.78rem;
  opacity: 0.6;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 640px) {
  .download-container {
    flex-direction: column;
  }

  .ad-sidebar {
    width: 100%;
  }

  .upload-zone {
    padding: 40px 20px;
  }

  .logo {
    font-size: 2rem;
  }

  .format-selector {
    flex-direction: column;
    align-items: stretch;
  }
}