/* =============================================
   PNG to PDF Converter - Main Stylesheet
   pngtopdfconverter.us
   ============================================= */

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --secondary: #0ea5e9;
  --accent: #f97316;
  --success: #22c55e;
  --dark: #0f172a;
  --gray-900: #111827;
  --gray-800: #1f2937;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --gray-100: #f3f4f6;
  --gray-50: #f9fafb;
  --white: #ffffff;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(37,99,235,0.08);
  --shadow-lg: 0 8px 40px rgba(37,99,235,0.14);
  --transition: all 0.22s cubic-bezier(.4,0,.2,1);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---- Typography ---- */
h1,h2,h3,h4,h5,h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
}
h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: 1.25rem; }
p { margin-bottom: 1rem; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }

.container { max-width: 1140px; margin: 0 auto; padding: 0 20px; }

/* ---- Header / Nav ---- */
header {
  position: sticky; top: 0; z-index: 999;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(37,99,235,0.08);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-size: 1.3rem; font-weight: 800;
  color: var(--gray-900); text-decoration: none;
}
.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.logo-icon svg { color: white; }
.logo span.highlight { color: var(--primary); }

nav ul { list-style: none; display: flex; gap: 6px; align-items: center; }
nav ul a {
  padding: 7px 14px; border-radius: 8px;
  font-size: 0.9rem; font-weight: 500; color: var(--gray-700);
}
nav ul a:hover, nav ul a.active { color: var(--primary); background: var(--primary-light); }
.nav-cta {
  background: var(--primary) !important; color: var(--white) !important;
  padding: 7px 18px !important; border-radius: 8px !important; font-weight: 600 !important;
}
.nav-cta:hover { background: var(--primary-dark) !important; }

.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--gray-800); margin: 5px 0; border-radius: 2px; transition: var(--transition); }

/* ---- Hero ---- */
.hero {
  background: linear-gradient(135deg, #eff6ff 0%, #f0f9ff 50%, #fafafa 100%);
  padding: 64px 0 40px;
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; top: -60px; right: -60px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(37,99,235,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.hero-content {
  display: grid; grid-template-columns: 1fr;
  gap: 16px; text-align: center; max-width: 760px; margin: 0 auto;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary-light); color: var(--primary);
  font-size: 0.8rem; font-weight: 600; padding: 5px 12px;
  border-radius: 999px; margin-bottom: 4px;
}
.hero h1 { margin-bottom: 12px; }
.hero h1 span { color: var(--primary); }
.hero-sub { font-size: 1.1rem; color: var(--gray-500); max-width: 580px; margin: 0 auto 24px; }
.hero-stats {
  display: flex; justify-content: center; gap: 28px; flex-wrap: wrap;
  margin-bottom: 8px;
}
.hero-stat { text-align: center; }
.hero-stat strong { display: block; font-size: 1.4rem; color: var(--primary); font-weight: 800; }
.hero-stat small { font-size: 0.78rem; color: var(--gray-500); }

/* ---- Converter Tool ---- */
.tool-section { padding: 0 0 60px; background: linear-gradient(180deg, #eff6ff 0%, #fff 100%); }
.tool-box {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 48px rgba(37,99,235,0.13);
  border: 1.5px solid rgba(37,99,235,0.10);
  overflow: hidden;
  max-width: 820px; margin: 0 auto;
}
.tool-header {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  padding: 18px 28px;
  display: flex; align-items: center; gap: 12px;
}
.tool-header h2 { color: white; font-size: 1.15rem; margin: 0; }
.tool-header-dots { display: flex; gap: 6px; }
.tool-header-dots span { width: 12px; height: 12px; border-radius: 50%; }
.dot-r { background: rgba(255,255,255,0.4); }
.dot-y { background: rgba(255,255,255,0.6); }
.dot-g { background: rgba(255,255,255,0.9); }

.tool-body { padding: 32px 28px; }

/* Drop Zone */
.drop-zone {
  border: 2.5px dashed rgba(37,99,235,0.3);
  border-radius: var(--radius);
  padding: 52px 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: rgba(219,234,254,0.15);
  position: relative;
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary);
  background: rgba(219,234,254,0.35);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.drop-zone input[type=file] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}
.drop-icon { font-size: 3rem; margin-bottom: 12px; }
.drop-title { font-size: 1.1rem; font-weight: 700; color: var(--gray-900); margin-bottom: 6px; }
.drop-sub { font-size: 0.875rem; color: var(--gray-500); margin-bottom: 16px; }
.drop-btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary); color: white;
  padding: 11px 24px; border-radius: 8px;
  font-size: 0.9rem; font-weight: 600;
  border: none; cursor: pointer;
  transition: var(--transition); z-index: 2; position: relative;
}
.drop-btn:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); }
.drop-formats { font-size: 0.75rem; color: var(--gray-500); margin-top: 12px; }

/* Options */
.tool-options {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 14px; margin: 20px 0;
}
.opt-group label {
  display: block; font-size: 0.78rem; font-weight: 600;
  color: var(--gray-600, #4b5563); margin-bottom: 5px; text-transform: uppercase; letter-spacing: 0.04em;
}
.opt-group select, .opt-group input[type=range] {
  width: 100%; padding: 8px 12px;
  border: 1.5px solid var(--gray-300);
  border-radius: 8px; font-size: 0.875rem;
  color: var(--gray-800); background: var(--white);
  appearance: none; outline: none;
  transition: var(--transition);
}
.opt-group select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.08); }

/* File Preview */
.file-list { margin: 16px 0; display: none; }
.file-list.visible { display: block; }
.file-list-title { font-size: 0.82rem; font-weight: 600; color: var(--gray-500); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.05em; }
.file-items { display: flex; flex-wrap: wrap; gap: 8px; }
.file-item {
  display: flex; align-items: center; gap: 8px;
  background: var(--gray-50); border: 1px solid var(--gray-300);
  border-radius: 8px; padding: 8px 12px;
  font-size: 0.83rem; color: var(--gray-700);
}
.file-item .file-thumb {
  width: 36px; height: 36px; object-fit: cover;
  border-radius: 4px; border: 1px solid var(--gray-300);
}
.file-item-info { flex: 1; min-width: 0; }
.file-item-name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 140px; }
.file-item-size { font-size: 0.75rem; color: var(--gray-500); }
.file-remove {
  background: none; border: none; cursor: pointer;
  color: var(--gray-500); font-size: 1rem; padding: 2px;
  border-radius: 4px; line-height: 1;
}
.file-remove:hover { color: #ef4444; background: #fef2f2; }

/* Convert Button */
.convert-actions { display: flex; gap: 12px; align-items: center; margin-top: 20px; flex-wrap: wrap; }
.btn-convert {
  flex: 1; padding: 14px 28px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white; border: none; border-radius: var(--radius);
  font-size: 1rem; font-weight: 700; cursor: pointer;
  transition: var(--transition); position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-convert:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37,99,235,0.3); }
.btn-convert:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-clear {
  padding: 14px 20px; background: var(--gray-100);
  color: var(--gray-700); border: 1.5px solid var(--gray-300);
  border-radius: var(--radius); font-size: 0.9rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
}
.btn-clear:hover { background: var(--gray-200); }

/* Progress */
.progress-wrap { margin-top: 20px; display: none; }
.progress-wrap.visible { display: block; }
.progress-bar-bg { background: var(--gray-100); border-radius: 999px; height: 8px; overflow: hidden; }
.progress-bar-fill {
  height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  width: 0%; transition: width 0.3s ease;
}
.progress-label { font-size: 0.82rem; color: var(--gray-500); margin-top: 6px; text-align: center; }

/* Result */
.result-box {
  display: none; margin-top: 20px;
  background: linear-gradient(135deg, #f0fdf4, #dcfce7);
  border: 1.5px solid #86efac;
  border-radius: var(--radius); padding: 20px;
  text-align: center;
}
.result-box.visible { display: block; }
.result-box h3 { color: #166534; margin-bottom: 8px; }
.result-box p { color: #15803d; font-size: 0.9rem; margin-bottom: 14px; }
.btn-download {
  display: inline-flex; align-items: center; gap: 8px;
  background: #16a34a; color: white;
  padding: 12px 28px; border-radius: 8px;
  font-size: 0.95rem; font-weight: 700;
  border: none; cursor: pointer; transition: var(--transition);
  text-decoration: none;
}
.btn-download:hover { background: #15803d; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(22,163,74,0.25); color: white; }

/* ---- Security Badges ---- */
.trust-bar {
  background: var(--white); padding: 18px 0;
  border-bottom: 1px solid var(--gray-100);
  border-top: 1px solid var(--gray-100);
}
.trust-inner { display: flex; justify-content: center; gap: 32px; flex-wrap: wrap; align-items: center; }
.trust-item { display: flex; align-items: center; gap: 7px; font-size: 0.82rem; color: var(--gray-600, #4b5563); font-weight: 500; }
.trust-icon { font-size: 1.1rem; }

/* ---- How to Use ---- */
.how-section { padding: 72px 0; background: var(--gray-50); }
.section-label { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--primary); margin-bottom: 10px; }
.section-title { margin-bottom: 12px; }
.section-sub { color: var(--gray-500); max-width: 520px; margin-bottom: 48px; }
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; }
.step-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  transition: var(--transition); position: relative;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-num {
  width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white; display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; font-weight: 800; margin-bottom: 16px;
}
.step-card h3 { font-size: 1rem; margin-bottom: 8px; }
.step-card p { font-size: 0.87rem; color: var(--gray-500); margin: 0; }

/* ---- Features ---- */
.features-section { padding: 72px 0; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; margin-top: 48px; }
.feature-card {
  padding: 28px; border-radius: var(--radius);
  border: 1.5px solid var(--gray-100);
  transition: var(--transition);
}
.feature-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
.feature-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: var(--primary-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 16px;
}
.feature-card h3 { margin-bottom: 8px; font-size: 1.05rem; }
.feature-card p { font-size: 0.87rem; color: var(--gray-500); margin: 0; }

/* ---- FAQ ---- */
.faq-section { padding: 72px 0; background: var(--gray-50); }
.faq-wrap { max-width: 760px; margin: 48px auto 0; }
.faq-item {
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius); margin-bottom: 12px;
  overflow: hidden; transition: var(--transition);
  background: var(--white);
}
.faq-item.open { border-color: var(--primary); box-shadow: var(--shadow); }
.faq-q {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 22px; cursor: pointer; gap: 12px;
  font-weight: 600; font-size: 0.97rem; color: var(--gray-900);
}
.faq-q span.icon {
  width: 26px; height: 26px; border-radius: 6px;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; flex-shrink: 0; font-weight: 700; transition: var(--transition);
}
.faq-item.open .faq-q span.icon { transform: rotate(45deg); }
.faq-a { padding: 0 22px 18px; font-size: 0.9rem; color: var(--gray-600, #4b5563); display: none; line-height: 1.7; }
.faq-item.open .faq-a { display: block; }

/* ---- About / Why Choose ---- */
.about-mini { padding: 72px 0; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-visual {
  background: linear-gradient(135deg, var(--primary-light), rgba(14,165,233,0.1));
  border-radius: var(--radius-lg); padding: 40px; text-align: center;
  position: relative;
}
.about-visual .big-num { font-size: 5rem; font-weight: 900; color: var(--primary); line-height: 1; }
.about-visual .big-label { font-size: 1rem; color: var(--gray-500); margin-top: 8px; }
.about-list { list-style: none; margin: 20px 0; }
.about-list li {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 0; border-bottom: 1px solid var(--gray-100);
  font-size: 0.9rem; color: var(--gray-700);
}
.about-list li:last-child { border-bottom: none; }
.check-icon { color: var(--success); font-size: 1rem; flex-shrink: 0; margin-top: 2px; }

/* ---- CTA Banner ---- */
.cta-section {
  padding: 72px 0;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  text-align: center; color: white;
}
.cta-section h2 { color: white; margin-bottom: 12px; }
.cta-section p { color: rgba(255,255,255,0.85); max-width: 520px; margin: 0 auto 28px; }
.btn-cta-white {
  display: inline-flex; align-items: center; gap: 8px;
  background: white; color: var(--primary);
  padding: 14px 32px; border-radius: var(--radius);
  font-size: 1rem; font-weight: 700; transition: var(--transition);
  text-decoration: none;
}
.btn-cta-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); color: var(--primary-dark); }

/* ---- Footer ---- */
footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: 48px 0 24px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 800;
  color: white; margin-bottom: 14px; text-decoration: none;
}
.footer-about p { font-size: 0.87rem; line-height: 1.7; color: var(--gray-300); }
footer h4 { color: white; font-size: 0.9rem; margin-bottom: 14px; }
footer ul { list-style: none; }
footer ul li { margin-bottom: 8px; }
footer ul li a { font-size: 0.87rem; color: var(--gray-300); transition: var(--transition); }
footer ul li a:hover { color: white; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 20px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px; font-size: 0.82rem;
}
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--gray-300); }
.footer-links a:hover { color: white; }

/* ---- Page Inner ---- */
.page-hero {
  background: linear-gradient(135deg, #eff6ff, #f0f9ff);
  padding: 56px 0; text-align: center;
}
.page-hero h1 { margin-bottom: 12px; }
.page-hero p { color: var(--gray-500); max-width: 560px; margin: 0 auto; }
.breadcrumb {
  font-size: 0.82rem; color: var(--gray-500); margin-bottom: 20px;
  display: flex; justify-content: center; gap: 6px; align-items: center;
}
.breadcrumb a { color: var(--primary); }

.content-section { padding: 64px 0; }
.content-section h2 { margin-bottom: 16px; margin-top: 36px; }
.content-section h3 { margin-bottom: 10px; margin-top: 24px; color: var(--primary); }
.content-section ul { padding-left: 20px; margin-bottom: 16px; }
.content-section ul li { margin-bottom: 8px; font-size: 0.95rem; color: var(--gray-700); }

/* Contact Form */
.contact-form { max-width: 640px; margin: 0 auto; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.83rem; font-weight: 600; color: var(--gray-700); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 11px 14px;
  border: 1.5px solid var(--gray-300); border-radius: 8px;
  font-size: 0.93rem; color: var(--gray-800); outline: none;
  transition: var(--transition); font-family: var(--font-sans);
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.08); }
.form-group textarea { resize: vertical; min-height: 120px; }
.btn-submit {
  width: 100%; padding: 14px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white; border: none; border-radius: var(--radius);
  font-size: 1rem; font-weight: 700; cursor: pointer; transition: var(--transition);
}
.btn-submit:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  nav ul { display: none; }
  nav ul.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: white; padding: 12px; box-shadow: var(--shadow-lg); z-index: 100; }
  .hamburger { display: block; }
  .tool-options { grid-template-columns: 1fr; }
  .steps-grid, .features-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .hero-stats { gap: 18px; }
  .trust-inner { gap: 16px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .convert-actions { flex-direction: column; }
  .btn-convert, .btn-clear { width: 100%; }
}