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

:root {
  --primary:       #6C63FF;
  --primary-2:     #3B82F6;
  --primary-dark:  #5550d4;
  --success:       #10B981;
  --danger:        #EF4444;
  --bg:            #0D0E1A;
  --bg-card:       #141526;
  --bg-card-2:     #1a1b30;
  --border:        rgba(108,99,255,.18);
  --border-light:  rgba(255,255,255,.06);
  --text:          #E8E8F0;
  --text-muted:    #8889A8;
  --text-faint:    #4B4C6A;
  --radius:        16px;
  --radius-sm:     10px;
  --shadow:        0 8px 40px rgba(0,0,0,.45);
  --ad-bg:         #11121F;
  --ad-border:     rgba(108,99,255,.12);
  --font:          'Inter', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── TYPOGRAPHY UTILS ── */
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── AD BANNER (top) ── */
.ad-banner--top {
  width: 100%;
  background: var(--ad-bg);
  border-bottom: 1px solid var(--ad-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px 16px;
  min-height: 64px;
}

/* ── HEADER ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,14,26,.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-icon { width: 36px; height: 36px; flex-shrink: 0; }
.logo-text { font-size: 1.25rem; font-weight: 700; color: var(--text); letter-spacing: -.3px; text-decoration: none; }
.logo-accent { color: var(--primary); }

/* Nav */
.site-nav { display: flex; gap: 28px; }
.site-nav a { color: var(--text-muted); text-decoration: none; font-size: .9rem; font-weight: 500; transition: color .2s; }
.site-nav a:hover { color: var(--text); }

/* ── HERO ── */
.hero {
  position: relative;
  text-align: center;
  padding: 80px 24px 60px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 60% 55% at 50% -10%, rgba(108,99,255,.22) 0%, transparent 70%),
    radial-gradient(ellipse 40% 35% at 80% 60%, rgba(59,130,246,.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(108,99,255,.12);
  border: 1px solid rgba(108,99,255,.28);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: .8rem;
  font-weight: 600;
  color: #a89fff;
  letter-spacing: .02em;
  margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.04em;
  margin-bottom: 18px;
}
.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto;
}

/* ── LAYOUT ── */
.layout-wrapper {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 16px 80px;
}

/* ── SIDEBAR ADS ── */
.ad-sidebar {
  position: sticky;
  top: 76px;
  padding-top: 8px;
}

/* ── AD PLACEHOLDERS ── */
.ad-placeholder {
  background: var(--ad-bg);
  border: 1px dashed var(--ad-border);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  width: 100%;
}
.ad-placeholder--tall { min-height: 600px; }
.ad-placeholder--sticky { min-height: 90px; flex: 1; }
.ad-label {
  font-size: .7rem;
  color: var(--text-faint);
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 500;
}

/* Inline ad (after result) */
.ad-inline {
  margin-top: 28px;
}
.ad-inline .ad-placeholder { min-height: 100px; }

/* ── STICKY BOTTOM AD ── */
.ad-sticky {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 200;
  background: var(--bg-card);
  border-top: 1px solid var(--border-light);
  box-shadow: 0 -4px 30px rgba(0,0,0,.5);
  padding: 6px 16px;
  display: flex;
  justify-content: center;
  max-height: 90px;
  /* Hide until AdSense fills the slot */
  min-height: 0;
  overflow: hidden;
}
/* Only show sticky bar when AdSense injects an ad iframe */
.ad-sticky:has(iframe) {
  min-height: 74px;
}
.ad-sticky-inner {
  position: relative;
  width: 100%;
  max-width: 728px;
  display: flex;
  align-items: center;
  max-height: 90px;
}
.ad-close {
  position: absolute;
  top: -4px; right: -4px;
  background: rgba(255,255,255,.08);
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 50%;
  width: 22px; height: 22px;
  display: flex; align-items: center; justify-content: center;
  font-size: .65rem;
  transition: background .2s;
  z-index: 1;
  flex-shrink: 0;
}
.ad-close:hover { background: rgba(255,255,255,.15); }

/* ── CONVERTER MAIN ── */
.converter-main {
  min-width: 0;
  padding-bottom: 48px;
}

/* ── DROP ZONE ── */
.drop-zone {
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 56px 32px 48px;
  text-align: center;
  cursor: pointer;
  transition: border-color .25s, background .25s, transform .2s;
  position: relative;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(108,99,255,.06);
  transform: translateY(-2px);
}
.drop-icon { width: 72px; height: 72px; margin: 0 auto 20px; }
.drop-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 6px; }
.drop-sub { font-size: .9rem; color: var(--text-muted); margin-bottom: 24px; }

.btn-browse {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  border: none;
  border-radius: 100px;
  padding: 12px 28px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s, transform .15s, box-shadow .2s;
  box-shadow: 0 4px 20px rgba(108,99,255,.4);
  font-family: var(--font);
}
.btn-browse:hover { opacity: .9; transform: translateY(-1px); box-shadow: 0 6px 28px rgba(108,99,255,.5); }
.btn-browse:active { transform: translateY(0); }

.drop-formats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
}
.format-chip {
  background: rgba(108,99,255,.1);
  border: 1px solid rgba(108,99,255,.2);
  color: #a89fff;
  border-radius: 6px;
  padding: 3px 10px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .04em;
}

/* ── FILE LIST ── */
.file-list {
  margin-top: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
}
.file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
}
.file-list-title { font-size: 1rem; font-weight: 600; }

.btn-clear {
  background: rgba(239,68,68,.1);
  border: 1px solid rgba(239,68,68,.2);
  color: #f87171;
  border-radius: 8px;
  padding: 6px 14px;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
  font-family: var(--font);
}
.btn-clear:hover { background: rgba(239,68,68,.18); }

#fileItems { list-style: none; }

.file-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 20px;
  border-bottom: 1px solid var(--border-light);
  transition: background .15s;
  animation: slideIn .2s ease;
}
.file-item:last-child { border-bottom: none; }
.file-item:hover { background: rgba(255,255,255,.02); }

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.file-icon {
  width: 36px; height: 36px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.file-icon--image { background: rgba(59,130,246,.15); }
.file-icon--doc   { background: rgba(16,185,129,.15); }
.file-icon--text  { background: rgba(245,158,11,.15); }
.file-icon--html  { background: rgba(239,68,68,.15); }

.file-info { flex: 1; min-width: 0; }
.file-name { font-size: .9rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-size { font-size: .75rem; color: var(--text-muted); margin-top: 2px; }

.file-remove {
  background: none;
  border: none;
  color: var(--text-faint);
  cursor: pointer;
  font-size: 1rem;
  padding: 4px;
  border-radius: 6px;
  transition: color .2s, background .2s;
  flex-shrink: 0;
}
.file-remove:hover { color: #f87171; background: rgba(239,68,68,.1); }

/* ── OPTIONS PANEL ── */
.options-panel {
  margin-top: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.options-title { font-size: 1rem; font-weight: 600; margin-bottom: 18px; }
.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
}
.option-group { display: flex; flex-direction: column; gap: 6px; }
.option-group label { font-size: .8rem; color: var(--text-muted); font-weight: 500; }

select {
  background: var(--bg-card-2);
  border: 1px solid var(--border-light);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-size: .9rem;
  font-family: var(--font);
  cursor: pointer;
  outline: none;
  transition: border-color .2s;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 9l6 6 6-6' stroke='%238889A8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
}
select:focus { border-color: var(--primary); }

/* ── CONVERT ROW ── */
.convert-row {
  margin-top: 22px;
  text-align: center;
}
.btn-convert {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  border: none;
  border-radius: 100px;
  padding: 16px 44px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity .2s, transform .15s, box-shadow .2s;
  box-shadow: 0 6px 30px rgba(108,99,255,.45);
  font-family: var(--font);
  letter-spacing: -.01em;
}
.btn-convert:hover { opacity: .9; transform: translateY(-2px); box-shadow: 0 10px 40px rgba(108,99,255,.55); }
.btn-convert:active { transform: translateY(0); }
.btn-convert:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.convert-note {
  font-size: .78rem;
  color: var(--text-faint);
  margin-top: 12px;
}

/* ── PROGRESS ── */
.progress-area { margin-top: 22px; text-align: center; }
.progress-bar-wrap {
  background: rgba(255,255,255,.06);
  border-radius: 100px;
  height: 8px;
  overflow: hidden;
  margin-bottom: 12px;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  border-radius: 100px;
  width: 0%;
  transition: width .4s ease;
}
.progress-label { font-size: .88rem; color: var(--text-muted); }

/* ── RESULT ── */
.result-area { margin-top: 24px; }
.result-card {
  background: var(--bg-card);
  border: 1px solid rgba(16,185,129,.25);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
}
.result-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: rgba(16,185,129,.12);
  border: 2px solid rgba(16,185,129,.3);
  color: var(--success);
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  animation: popIn .4s cubic-bezier(.34,1.56,.64,1) both;
}
@keyframes popIn {
  from { opacity: 0; transform: scale(.5); }
  to   { opacity: 1; transform: scale(1); }
}
.result-card h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 8px; }
.result-card p  { color: var(--text-muted); margin-bottom: 26px; }
.result-actions { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; }

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--success), #059669);
  color: #fff;
  border: none;
  border-radius: 100px;
  padding: 13px 32px;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity .2s, transform .15s;
  box-shadow: 0 4px 20px rgba(16,185,129,.35);
  font-family: var(--font);
}
.btn-download:hover { opacity: .9; transform: translateY(-1px); }

.btn-another {
  background: rgba(255,255,255,.06);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  border-radius: 100px;
  padding: 13px 28px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s, color .2s;
  font-family: var(--font);
}
.btn-another:hover { background: rgba(255,255,255,.1); color: var(--text); }

/* ── HOW IT WORKS ── */
.how-section { margin-top: 64px; }
.section-title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -.03em;
  margin-bottom: 28px;
  text-align: center;
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 26px 22px;
  transition: border-color .2s, transform .2s;
}
.step-card:hover { border-color: var(--border); transform: translateY(-3px); }
.step-num {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 12px;
}
.step-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.step-card p  { font-size: .85rem; color: var(--text-muted); }

/* ── FORMATS ── */
.formats-section { margin-top: 52px; }
.formats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.format-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  transition: border-color .2s;
}
.format-card:hover { border-color: var(--border); }
.format-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}
.format-icon--img  { background: rgba(59,130,246,.12); }
.format-icon--doc  { background: rgba(16,185,129,.12); }
.format-icon--txt  { background: rgba(245,158,11,.12); }
.format-icon--html { background: rgba(239,68,68,.12); }
.format-card strong { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 2px; }
.format-card p      { font-size: .78rem; color: var(--text-muted); }

/* ── FAQ ── */
.faq-section { margin-top: 52px; }
.faq-list { display: flex; flex-direction: column; gap: 10px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color .2s;
}
.faq-item[open] { border-color: var(--border); }
.faq-item summary {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: .95rem;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--primary);
  flex-shrink: 0;
}
.faq-item[open] summary::after { content: '−'; }
.faq-item p {
  padding: 0 20px 16px;
  font-size: .88rem;
  color: var(--text-muted);
}

/* ── FOOTER ── */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-light);
  padding: 40px 24px 120px;
}
.footer-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.footer-copy { font-size: .82rem; color: var(--text-faint); }
.footer-nav { display: flex; gap: 24px; }
.footer-nav a { font-size: .82rem; color: var(--text-muted); text-decoration: none; transition: color .2s; }
.footer-nav a:hover { color: var(--primary); }

/* ── GUIDES SECTION ── */
.guides-section { margin-top: 52px; }
.guides-intro { text-align: center; color: var(--text-muted); font-size: .95rem; margin-bottom: 1.75rem; max-width: 560px; margin-left: auto; margin-right: auto; }
.guides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}
.guide-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  text-decoration: none;
  transition: border-color .25s, transform .25s, box-shadow .25s;
}
.guide-card:hover { border-color: var(--border); transform: translateY(-3px); box-shadow: 0 10px 30px rgba(108,99,255,.12); }
.guide-card-icon { font-size: 2rem; flex-shrink: 0; line-height: 1; padding-top: .1rem; }
.guide-card-tag { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--primary); margin-bottom: .3rem; }
.guide-card-body h3 { font-size: .95rem; font-weight: 700; color: var(--text); margin-bottom: .35rem; line-height: 1.35; }
.guide-card-desc { font-size: .8rem; color: var(--text-muted); line-height: 1.6; margin: 0; }
.guides-cta { text-align: center; }

/* ── RESPONSIVE ── */
@media (max-width: 860px) {
  .steps-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .hero    { padding: 48px 16px 36px; }
  .site-nav { gap: 16px; }
  .drop-zone { padding: 40px 20px 36px; }
  .options-grid { grid-template-columns: 1fr 1fr; }
  .guides-grid { grid-template-columns: 1fr; }
}