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

:root {
  --primary:       #4F46E5;
  --primary-dark:  #4338CA;
  --primary-light: #818CF8;
  --accent:        #7C3AED;
  --bg:            #F8FAFC;
  --surface:       #FFFFFF;
  --border:        #E2E8F0;
  --text:          #1E293B;
  --text-muted:    #64748B;
  --success:       #10B981;
  --success-bg:    #D1FAE5;
  --danger:        #EF4444;
  --radius:        12px;
  --radius-sm:     8px;
  --shadow:        0 1px 3px rgba(0,0,0,.07), 0 4px 12px rgba(0,0,0,.05);
  --shadow-lg:     0 10px 40px rgba(0,0,0,.12);
  --transition:    .2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

img { max-width: 100%; display: block; }
a  { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ────────────────────────────────────────────────────────────────── */
.container { max-width: 1160px; margin: 0 auto; padding: 0 1.5rem; }
.hidden    { display: none !important; }

/* ── Header / Nav ───────────────────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 2rem;
}
.nav-logo {
  font-size: 1.25rem; font-weight: 700; color: var(--primary);
  display: flex; align-items: center; gap: .5rem;
  text-decoration: none;
}
.nav-logo-icon {
  width: 32px; height: 32px; background: var(--primary);
  border-radius: 8px; display: grid; place-items: center;
  color: white; font-weight: 800; font-size: .9rem;
}
.nav-links { display: flex; align-items: center; gap: 1.75rem; list-style: none; }
.nav-links a { color: var(--text-muted); font-weight: 500; transition: color var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--primary); text-decoration: none; }
.nav-cta {
  background: var(--primary); color: white !important;
  padding: .45rem 1.1rem; border-radius: var(--radius-sm);
  font-weight: 600; transition: background var(--transition);
}
.nav-cta:hover { background: var(--primary-dark) !important; }

/* ── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .5rem; padding: .65rem 1.4rem;
  border-radius: var(--radius-sm); border: none;
  font-size: 1rem; font-weight: 600; cursor: pointer;
  transition: all var(--transition); text-decoration: none;
}
.btn-primary  { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(79,70,229,.35); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; }
.btn-outline  { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: white; }
.btn-success  { background: var(--success); color: white; }
.btn-success:hover { background: #059669; }
.btn-lg       { padding: .85rem 2rem; font-size: 1.1rem; }
.btn-sm       { padding: .4rem .9rem; font-size: .875rem; }
.btn-full     { width: 100%; }

/* ── Hero ───────────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  color: white; padding: 5rem 0 4rem; text-align: center;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem); font-weight: 800;
  line-height: 1.15; margin-bottom: 1.25rem;
}
.hero h1 em { font-style: normal; color: #A5B4FC; }
.hero p {
  font-size: 1.15rem; opacity: .88; max-width: 580px;
  margin: 0 auto 2rem;
}
.hero-badges {
  display: flex; justify-content: center; flex-wrap: wrap;
  gap: .75rem; margin-bottom: 2.5rem;
}
.hero-badge {
  background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.3);
  border-radius: 100px; padding: .3rem .9rem;
  font-size: .875rem; font-weight: 500;
}

/* ── Tool section ───────────────────────────────────────────────────────────── */
.tool-section { padding: 3rem 0 4rem; }
.tool-layout  { display: grid; grid-template-columns: 1fr 320px; gap: 2rem; align-items: start; }

/* Drop zone */
.drop-zone {
  border: 2.5px dashed var(--border); border-radius: var(--radius);
  padding: 3.5rem 2rem; text-align: center;
  cursor: pointer; transition: all var(--transition);
  background: var(--surface);
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--primary); background: #EEF2FF;
}
.drop-zone.drag-over { transform: scale(1.01); }
.drop-icon { font-size: 3rem; margin-bottom: 1rem; }
.drop-zone h2 { font-size: 1.2rem; margin-bottom: .5rem; }
.drop-zone p  { color: var(--text-muted); font-size: .9rem; margin-bottom: 1.5rem; }
.drop-formats { font-size: .8rem; color: var(--text-muted); margin-top: .75rem; }

/* File list */
.file-list { display: flex; flex-direction: column; gap: .5rem; margin-top: 1rem; }
.file-item {
  display: flex; align-items: center; gap: .75rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: .6rem .9rem;
}
.file-thumb {
  width: 48px; height: 48px; object-fit: cover;
  border-radius: 6px; flex-shrink: 0;
}
.file-info   { flex: 1; min-width: 0; }
.file-name   { font-size: .875rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: block; }
.file-size   { font-size: .8rem; color: var(--text-muted); }
.file-remove {
  background: none; border: none; cursor: pointer;
  color: var(--text-muted); font-size: 1.25rem; line-height: 1;
  padding: .25rem; border-radius: 4px; transition: color var(--transition);
}
.file-remove:hover { color: var(--danger); }

/* Options panel */
.options-panel {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  position: sticky; top: 80px;
}
.options-panel h3 { font-size: 1rem; font-weight: 700; margin-bottom: 1.25rem; }
.option-group { margin-bottom: 1.25rem; }
.option-label {
  display: flex; justify-content: space-between;
  font-size: .875rem; font-weight: 600; margin-bottom: .5rem;
}
.quality-val { color: var(--primary); font-weight: 700; }
.slider {
  -webkit-appearance: none; width: 100%; height: 6px;
  border-radius: 3px; background: var(--border); outline: none;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px;
  border-radius: 50%; background: var(--primary); cursor: pointer;
  box-shadow: 0 0 0 3px rgba(79,70,229,.2);
}
.slider-hints {
  display: flex; justify-content: space-between;
  font-size: .75rem; color: var(--text-muted); margin-top: .4rem;
}
.option-hint { font-size: .8rem; color: var(--text-muted); line-height: 1.4; }

/* Progress */
.progress-wrap { margin: 1.5rem 0; }
.progress-text { font-size: .875rem; color: var(--text-muted); margin-bottom: .5rem; font-weight: 500; }
.progress-track {
  height: 8px; background: var(--border); border-radius: 4px; overflow: hidden;
}
.progress-bar {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 4px; transition: width .3s ease;
}

/* Stats */
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1rem; margin: 2rem 0;
}
.stat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem; text-align: center;
}
.stat-label { font-size: .8rem; color: var(--text-muted); font-weight: 500; margin-bottom: .4rem; }
.stat-value { font-size: 1.4rem; font-weight: 800; color: var(--primary); }
.stat-card.stat-gain .stat-value { color: var(--success); }

/* ZIP button */
.zip-wrap { margin: 1rem 0 2rem; }

/* Results */
.results-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(440px, 1fr)); gap: 1.5rem; }
.result-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.result-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--border);
}
.result-filename { font-size: .95rem; font-weight: 600; }
.result-badge {
  font-size: .8rem; font-weight: 700; padding: .25rem .7rem;
  border-radius: 100px;
}
.badge-success { background: var(--success-bg); color: #065F46; }
.badge-neutral { background: #FEF3C7; color: #92400E; }

.result-images {
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center; gap: .75rem; padding: 1.25rem;
}
.result-image-wrap { text-align: center; }
.result-image-label { font-size: .75rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .05em; margin-bottom: .5rem; }
.result-image {
  width: 100%; height: 140px; object-fit: cover;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
}
.result-image-size { font-size: .8rem; font-weight: 600; margin-top: .4rem; color: var(--text-muted); }
.result-size-new   { color: var(--success); }
.result-arrow      { font-size: 1.25rem; color: var(--text-muted); }

.result-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: .75rem 1.25rem; border-top: 1px solid var(--border);
  background: var(--bg);
}
.result-saving { font-size: .875rem; color: var(--text-muted); }

/* ── Features ───────────────────────────────────────────────────────────────── */
.features { padding: 4rem 0; background: var(--surface); border-top: 1px solid var(--border); }
.section-title { font-size: 1.75rem; font-weight: 800; text-align: center; margin-bottom: .75rem; }
.section-sub   { text-align: center; color: var(--text-muted); margin-bottom: 3rem; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.feature-card  { text-align: center; padding: 1.5rem; }
.feature-icon  { font-size: 2.5rem; margin-bottom: 1rem; }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: .5rem; }
.feature-card p  { color: var(--text-muted); font-size: .95rem; }

/* ── Blog ───────────────────────────────────────────────────────────────────── */
.blog-section { padding: 4rem 0; }
.blog-grid    { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; }
.blog-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: transform var(--transition), box-shadow var(--transition);
}
.blog-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.blog-card-img   { height: 160px; display: grid; place-items: center; font-size: 3rem; }
.blog-card-body  { padding: 1.25rem; }
.blog-tag {
  display: inline-block; background: #EEF2FF; color: var(--primary);
  font-size: .75rem; font-weight: 600; padding: .2rem .6rem;
  border-radius: 4px; margin-bottom: .75rem;
}
.blog-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .5rem; line-height: 1.4; }
.blog-card p  { font-size: .875rem; color: var(--text-muted); margin-bottom: 1rem; line-height: 1.5; }
.blog-card-link { font-size: .875rem; font-weight: 600; color: var(--primary); }
.blog-card-link:hover { text-decoration: none; color: var(--primary-dark); }

/* ── Article ────────────────────────────────────────────────────────────────── */
.article-hero  { background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%); color: white; padding: 3.5rem 0; }
.article-meta  { font-size: .875rem; opacity: .8; margin-bottom: 1rem; }
.article-hero h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 800; line-height: 1.2; max-width: 760px; }

.article-body  { max-width: 760px; margin: 3rem auto; padding: 0 1.5rem 4rem; }
.article-body h2 { font-size: 1.5rem; font-weight: 800; margin: 2.5rem 0 1rem; color: var(--text); }
.article-body h3 { font-size: 1.15rem; font-weight: 700; margin: 2rem 0 .75rem; color: var(--text); }
.article-body p  { margin-bottom: 1.25rem; color: var(--text); line-height: 1.75; }
.article-body ul, .article-body ol { margin: 0 0 1.25rem 1.5rem; }
.article-body li { margin-bottom: .4rem; line-height: 1.7; }
.article-body pre {
  background: #1E293B; color: #E2E8F0;
  padding: 1.25rem; border-radius: var(--radius-sm);
  overflow-x: auto; margin-bottom: 1.25rem;
  font-size: .875rem; line-height: 1.6;
}
.article-body code { font-family: 'Fira Code', 'Cascadia Code', monospace; }
.article-body :not(pre) > code {
  background: #EEF2FF; color: var(--primary);
  padding: .1em .4em; border-radius: 4px; font-size: .875em;
}
.article-body table {
  width: 100%; border-collapse: collapse;
  margin-bottom: 1.5rem; font-size: .9rem;
}
.article-body th {
  background: var(--primary); color: white;
  padding: .75rem 1rem; text-align: left;
}
.article-body td { padding: .65rem 1rem; border-bottom: 1px solid var(--border); }
.article-body tr:nth-child(even) td { background: var(--bg); }

.article-cta {
  background: linear-gradient(135deg, #EEF2FF, #F5F3FF);
  border: 1.5px solid #C7D2FE; border-radius: var(--radius);
  padding: 2rem; text-align: center; margin-top: 3rem;
}
.article-cta h3 { font-size: 1.2rem; font-weight: 800; margin-bottom: .75rem; }
.article-cta p  { color: var(--text-muted); margin-bottom: 1.25rem; }

.breadcrumb { font-size: .875rem; margin-bottom: 1rem; }
.breadcrumb a { color: rgba(255,255,255,.75); }
.breadcrumb a:hover { color: white; }
.breadcrumb span { opacity: .6; margin: 0 .4rem; }

/* ── Blog index ──────────────────────────────────────────────────────────────── */
.blog-hero { background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%); color: white; padding: 3.5rem 0; text-align: center; }
.blog-hero h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: .75rem; }
.blog-hero p  { opacity: .88; font-size: 1.1rem; }
.blog-main    { padding: 3rem 0 5rem; }
.blog-grid-main { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 2rem; }

/* ── Legal ───────────────────────────────────────────────────────────────────── */
.legal-body { max-width: 800px; margin: 3rem auto; padding: 0 1.5rem 5rem; }
.legal-body h1 { font-size: 2rem; font-weight: 800; margin-bottom: .5rem; }
.legal-body .legal-date { color: var(--text-muted); font-size: .9rem; margin-bottom: 2rem; }
.legal-body h2 { font-size: 1.25rem; font-weight: 700; margin: 2rem 0 .75rem; }
.legal-body p, .legal-body li { line-height: 1.75; margin-bottom: .75rem; color: var(--text); }
.legal-body ul { margin-left: 1.5rem; }

/* ── Footer ──────────────────────────────────────────────────────────────────── */
.site-footer {
  background: #1E293B; color: #94A3B8;
  padding: 2.5rem 0;
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem;
}
.footer-logo { font-weight: 700; color: white; font-size: 1rem; }
.footer-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.footer-links a { color: #94A3B8; font-size: .875rem; }
.footer-links a:hover { color: white; }
.footer-copy { font-size: .875rem; }

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .tool-layout    { grid-template-columns: 1fr; }
  .options-panel  { position: static; }
  .stats-grid     { grid-template-columns: repeat(2, 1fr); }
  .features-grid  { grid-template-columns: 1fr 1fr; }
  .blog-grid      { grid-template-columns: repeat(2, 1fr); }
  .results-grid   { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .nav-links { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .blog-grid, .blog-grid-main { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .result-images { grid-template-columns: 1fr; }
  .result-arrow { transform: rotate(90deg); }
  .footer-inner { flex-direction: column; text-align: center; }
}