/* ========================================
   Quickq - Modern Minimal CSS
======================================== */
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #818CF8;
  --secondary: #10B981;
  --accent: #F59E0B;
  --bg: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-dark: #111827;
  --text: #1F2937;
  --text-light: #6B7280;
  --text-lighter: #9CA3AF;
  --border: #E5E7EB;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --max-w: 1200px;
  --transition: 0.3s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif; color: var(--text); background: var(--bg); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.92); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.4rem; font-weight: 800; color: var(--primary); letter-spacing: -0.5px; }
.logo-icon { width: 38px; height: 38px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: white; font-size: 1.1rem; font-weight: 900; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a { padding: 8px 16px; border-radius: 8px; font-size: 0.92rem; font-weight: 500; color: var(--text-light); transition: all var(--transition); }
.nav a:hover, .nav a.active { color: var(--primary); background: rgba(79,70,229,0.06); }
.nav-cta { margin-left: 12px; padding: 10px 22px !important; background: var(--primary) !important; color: white !important; font-weight: 600; border-radius: 10px !important; box-shadow: 0 4px 14px rgba(79,70,229,0.35); transition: all var(--transition) !important; }
.nav-cta:hover { background: var(--primary-dark) !important; box-shadow: 0 6px 20px rgba(79,70,229,0.45); transform: translateY(-1px); }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; border-radius: 8px; transition: background var(--transition); }
.hamburger:hover { background: var(--bg-secondary); }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: all var(--transition); }
.mobile-nav { display: none; position: fixed; top: 72px; left: 0; right: 0; background: white; border-bottom: 1px solid var(--border); padding: 16px 24px 24px; box-shadow: var(--shadow); z-index: 99; flex-direction: column; gap: 4px; }
.mobile-nav.open { display: flex; }
.mobile-nav a { padding: 12px 16px; border-radius: 10px; font-size: 1rem; font-weight: 500; color: var(--text); transition: all var(--transition); }
.mobile-nav a:hover { background: var(--bg-secondary); color: var(--primary); }
.hero { padding: 96px 0 80px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%); width: 800px; height: 800px; background: radial-gradient(ellipse, rgba(79,70,229,0.07) 0%, transparent 70%); pointer-events: none; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px 6px 8px; background: rgba(79,70,229,0.08); border: 1px solid rgba(79,70,229,0.15); border-radius: 100px; font-size: 0.82rem; font-weight: 600; color: var(--primary); margin-bottom: 28px; }
.hero-badge-dot { width: 20px; height: 20px; background: var(--primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: white; font-size: 0.65rem; }
.hero h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); font-weight: 900; line-height: 1.12; letter-spacing: -1.5px; color: var(--text); margin-bottom: 22px; }
.hero h1 .gradient-text { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: 1.15rem; color: var(--text-light); max-width: 580px; margin: 0 auto 40px; line-height: 1.8; }
.hero-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn-primary { display: inline-flex; align-items: center; gap: 8px; padding: 14px 30px; background: var(--primary); color: white; font-weight: 700; font-size: 1rem; border-radius: 12px; border: none; cursor: pointer; box-shadow: 0 4px 14px rgba(79,70,229,0.35); transition: all var(--transition); }
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 8px 24px rgba(79,70,229,0.4); transform: translateY(-2px); }
.btn-secondary { display: inline-flex; align-items: center; gap: 8px; padding: 14px 30px; background: white; color: var(--text); font-weight: 600; font-size: 1rem; border-radius: 12px; border: 1.5px solid var(--border); cursor: pointer; transition: all var(--transition); }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); box-shadow: var(--shadow-sm); }
.section { padding: 88px 0; }
.section-alt { background: var(--bg-secondary); }
.section-tag { display: inline-block; padding: 4px 14px; background: rgba(79,70,229,0.08); color: var(--primary); font-size: 0.78rem; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; border-radius: 100px; margin-bottom: 16px; }
.section-title { font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 900; letter-spacing: -0.8px; line-height: 1.2; color: var(--text); margin-bottom: 16px; }
.section-desc { font-size: 1.05rem; color: var(--text-light); max-width: 560px; line-height: 1.8; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header .section-desc { margin: 0 auto; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.feature-card { padding: 32px 28px; background: white; border-radius: var(--radius-lg); border: 1px solid var(--border); transition: all var(--transition); position: relative; overflow: hidden; }
.feature-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--primary), var(--primary-light)); opacity: 0; transition: opacity var(--transition); }
.feature-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: transparent; }
.feature-card:hover::before { opacity: 1; }
.feature-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 20px; }
.feature-icon-purple { background: rgba(79,70,229,0.1); }
.feature-icon-green { background: rgba(16,185,129,0.1); }
.feature-icon-amber { background: rgba(245,158,11,0.1); }
.feature-icon-rose { background: rgba(244,63,94,0.1); }
.feature-icon-blue { background: rgba(59,130,246,0.1); }
.feature-icon-teal { background: rgba(20,184,166,0.1); }
.feature-card h3 { font-size: 1.1rem; font-weight: 800; color: var(--text); margin-bottom: 10px; letter-spacing: -0.2px; }
.feature-card p { font-size: 0.9rem; color: var(--text-light); line-height: 1.75; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-num { font-size: 2.6rem; font-weight: 900; color: var(--primary); letter-spacing: -1px; line-height: 1; margin-bottom: 6px; }
.stat-label { font-size: 0.85rem; color: var(--text-light); font-weight: 500; }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 32px; }
.step-item { text-align: center; }
.step-num { width: 56px; height: 56px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: white; font-size: 1.3rem; font-weight: 900; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; box-shadow: 0 4px 16px rgba(79,70,229,0.3); }
.step-item h3 { font-size: 1.05rem; font-weight: 800; margin-bottom: 8px; color: var(--text); }
.step-item p { font-size: 0.88rem; color: var(--text-light); line-height: 1.7; }
.testimonials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.testimonial-card { padding: 32px 28px; background: white; border-radius: var(--radius-lg); border: 1px solid var(--border); transition: all var(--transition); }
.testimonial-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.testimonial-stars { color: var(--accent); font-size: 0.95rem; margin-bottom: 16px; letter-spacing: 2px; }
.testimonial-text { font-size: 0.92rem; color: var(--text); line-height: 1.8; margin-bottom: 20px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--primary-light)); display: flex; align-items: center; justify-content: center; color: white; font-weight: 800; font-size: 0.9rem; }
.testimonial-name { font-weight: 700; font-size: 0.9rem; color: var(--text); }
.testimonial-role { font-size: 0.78rem; color: var(--text-light); }
.cta-banner { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); border-radius: var(--radius-lg); padding: 72px 48px; text-align: center; color: white; position: relative; overflow: hidden; }
.cta-banner::before { content: ''; position: absolute; top: -50%; right: -20%; width: 500px; height: 500px; background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%); }
.cta-banner h2 { font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 900; letter-spacing: -0.5px; margin-bottom: 14px; position: relative; }
.cta-banner p { font-size: 1.05rem; opacity: 0.85; margin-bottom: 32px; position: relative; }
.btn-white { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; background: white; color: var(--primary); font-weight: 700; font-size: 1rem; border-radius: 12px; border: none; cursor: pointer; transition: all var(--transition); position: relative; box-shadow: 0 4px 14px rgba(0,0,0,0.15); }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }
.download-hero { padding: 80px 0 60px; text-align: center; }
.download-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; max-width: 900px; margin: 0 auto; }
.download-card { padding: 40px 32px; background: white; border: 1.5px solid var(--border); border-radius: var(--radius-lg); text-align: center; transition: all var(--transition); position: relative; }
.download-card:hover { border-color: var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.download-card.popular { border-color: var(--primary); box-shadow: 0 4px 24px rgba(79,70,229,0.15); }
.popular-badge { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); padding: 4px 18px; background: var(--primary); color: white; font-size: 0.75rem; font-weight: 700; border-radius: 100px; letter-spacing: 0.5px; }
.download-card h3 { font-size: 1.2rem; font-weight: 800; margin-bottom: 6px; color: var(--text); }
.download-card .ver { font-size: 0.82rem; color: var(--text-lighter); margin-bottom: 20px; }
.download-card .desc { font-size: 0.88rem; color: var(--text-light); margin-bottom: 24px; line-height: 1.7; }
.platform-icon { font-size: 2.5rem; margin-bottom: 16px; }
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.55); z-index: 1000; align-items: center; justify-content: center; padding: 24px; backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.modal-overlay.open { display: flex; }
.modal { background: white; border-radius: var(--radius-lg); padding: 40px 36px; max-width: 440px; width: 100%; text-align: center; box-shadow: var(--shadow-lg); animation: modalIn 0.3s ease; position: relative; }
@keyframes modalIn { from { opacity: 0; transform: scale(0.92) translateY(20px); } to { opacity: 1; transform: scale(1) translateY(0); } }
.modal-close { position: absolute; top: 16px; right: 16px; width: 32px; height: 32px; border-radius: 8px; background: var(--bg-secondary); border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1rem; color: var(--text-light); transition: all var(--transition); }
.modal-close:hover { background: var(--border); color: var(--text); }
.modal-icon { width: 72px; height: 72px; border-radius: 50%; background: rgba(79,70,229,0.1); display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 2rem; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.06); } }
.modal h3 { font-size: 1.3rem; font-weight: 900; color: var(--text); margin-bottom: 10px; }
.modal p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 24px; line-height: 1.7; }
.modal-progress { width: 100%; height: 6px; background: var(--bg-secondary); border-radius: 100px; overflow: hidden; margin-bottom: 14px; }
.modal-progress-bar { height: 100%; background: linear-gradient(90deg, var(--primary), var(--primary-light)); border-radius: 100px; animation: progressFill 2s ease forwards; width: 0; }
@keyframes progressFill { to { width: 100%; } }
.modal-hint { font-size: 0.78rem; color: var(--text-lighter); }
.footer { background: var(--bg-dark); color: rgba(255,255,255,0.65); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-brand .logo { color: white; margin-bottom: 14px; }
.footer-brand .logo-icon { background: linear-gradient(135deg, var(--primary-light), var(--primary)); }
.footer-brand p { font-size: 0.85rem; line-height: 1.8; color: rgba(255,255,255,0.5); }
.footer-col h4 { font-size: 0.82rem; font-weight: 700; color: white; letter-spacing: 0.5px; text-transform: uppercase; margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 0.85rem; color: rgba(255,255,255,0.5); transition: color var(--transition); }
.footer-col a:hover { color: white; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 28px; display: flex; align-items: center; justify-content: space-between; font-size: 0.8rem; color: rgba(255,255,255,0.35); flex-wrap: wrap; gap: 12px; }
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { color: rgba(255,255,255,0.35); font-size: 0.8rem; transition: color var(--transition); }
.footer-bottom-links a:hover { color: rgba(255,255,255,0.7); }
.page-hero { padding: 72px 0 56px; text-align: center; background: var(--bg-secondary); }
.page-hero h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 900; letter-spacing: -1px; color: var(--text); margin-bottom: 14px; }
.page-hero p { font-size: 1.05rem; color: var(--text-light); max-width: 560px; margin: 0 auto; line-height: 1.8; }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; margin-bottom: 80px; }
.about-content h2 { font-size: clamp(1.6rem, 2.5vw, 2.2rem); font-weight: 900; letter-spacing: -0.5px; line-height: 1.25; margin-bottom: 18px; color: var(--text); }
.about-content p { font-size: 0.95rem; color: var(--text-light); line-height: 1.85; margin-bottom: 14px; }
.about-visual { background: linear-gradient(135deg, rgba(79,70,229,0.08), rgba(129,140,248,0.12)); border-radius: var(--radius-lg); height: 360px; display: flex; align-items: center; justify-content: center; font-size: 4rem; border: 1px solid rgba(79,70,229,0.1); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-item-icon { width: 44px; height: 44px; border-radius: 12px; background: rgba(79,70,229,0.08); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }
.contact-item h4 { font-weight: 700; font-size: 0.95rem; color: var(--text); margin-bottom: 4px; }
.contact-item p { font-size: 0.85rem; color: var(--text-light); line-height: 1.7; }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--text); }
.form-group input, .form-group textarea { padding: 12px 16px; border: 1.5px solid var(--border); border-radius: 10px; font-size: 0.92rem; font-family: inherit; color: var(--text); background: white; transition: all var(--transition); outline: none; resize: vertical; }
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.form-group textarea { min-height: 120px; }
.faq-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { border: 1.5px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: all var(--transition); }
.faq-item.open { border-color: var(--primary); box-shadow: 0 2px 12px rgba(79,70,229,0.1); }
.faq-q { width: 100%; padding: 18px 22px; background: none; border: none; text-align: left; font-size: 0.95rem; font-weight: 700; color: var(--text); cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 12px; font-family: inherit; transition: all var(--transition); }
.faq-q:hover { color: var(--primary); }
.faq-q .icon { width: 28px; height: 28px; border-radius: 8px; background: var(--bg-secondary); display: flex; align-items: center; justify-content: center; font-size: 0.75rem; transition: all var(--transition); flex-shrink: 0; }
.faq-item.open .faq-q .icon { background: rgba(79,70,229,0.1); color: var(--primary); transform: rotate(180deg); }
.faq-a { display: none; padding: 0 22px 18px; font-size: 0.88rem; color: var(--text-light); line-height: 1.8; }
.faq-item.open .faq-a { display: block; }
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; max-width: 960px; margin: 0 auto; }
.pricing-card { padding: 40px 32px; background: white; border: 1.5px solid var(--border); border-radius: var(--radius-lg); text-align: center; transition: all var(--transition); }
.pricing-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.pricing-card.featured { border-color: var(--primary); box-shadow: 0 4px 24px rgba(79,70,229,0.15); }
.pricing-card h3 { font-size: 1.1rem; font-weight: 800; color: var(--text); margin-bottom: 8px; }
.pricing-card .price { font-size: 2.8rem; font-weight: 900; color: var(--primary); letter-spacing: -1px; margin-bottom: 4px; }
.pricing-card .price span { font-size: 0.9rem; color: var(--text-light); font-weight: 500; }
.pricing-card .billing { font-size: 0.8rem; color: var(--text-lighter); margin-bottom: 24px; }
.pricing-features { text-align: left; display: flex; flex-direction: column; gap: 10px; margin-bottom: 28px; }
.pricing-features li { display: flex; align-items: center; gap: 10px; font-size: 0.88rem; color: var(--text-light); }
.pricing-features li::before { content: 'SUCCESS'; color: var(--secondary); font-weight: 900; font-size: 0.8rem; }
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (max-width: 768px) {
  .nav { display: none; }
  .hamburger { display: flex; }
  .hero { padding: 64px 0 56px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-brand { grid-column: 1 / -1; }
  .about-content { grid-template-columns: 1fr; gap: 32px; }
  .about-visual { height: 240px; }
  .contact-grid { grid-template-columns: 1fr; }
  .cta-banner { padding: 48px 24px; }
  .section { padding: 64px 0; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-num { font-size: 2rem; }
}