:root{
    --primary: #2D9CDB;
    --primary-dark: #1E7BB8;
    --primary-light: #E6F4FF;
    --text: #333333;
    --text-secondary: #666666;
    --text-light: #888888;
    --bg: #FFFFFF;
    --bg-light: #F8F9FA;
    --bg-card: #FFFFFF;
    --border: #E0E0E0;
    --shadow: rgba(0,0,0,0.08);
    --shadow-hover: rgba(0,0,0,0.15);
    --radius: 12px;
    --transition: all 0.28s cubic-bezier(.2,.9,.3,1);
    --container-max: 1200px;
    --header-height: 72px;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body{
    margin:0;
    font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    background-color: var(--bg);
    color: var(--text);
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
    -moz-osx-font-smoothing:grayscale;
    overflow-x: hidden;
}

/* Accessibility helpers */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0 0 0 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Container */
.container{
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* Buttons */
.btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:.6rem;
    padding:12px 20px;
    border-radius: var(--radius);
    font-weight:600;
    text-decoration:none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size:16px;
    background: transparent;
    color: inherit;
}
.btn:focus { outline: 3px solid color-mix(in srgb, var(--primary) 20%, white); outline-offset: 3px; }
.btn-primary { background-color: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(45,156,219,0.12); }
.btn-primary:hover { background-color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 12px 30px var(--shadow-hover); }
.btn-secondary { background-color: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background-color: var(--bg-light); transform: translateY(-2px); }

/* Full-width button for pricing */
.btn-block { width: 100%; text-align: center; padding-left: 0; padding-right: 0; }

/* Headings & typography */
h1, h2, h3, h4 { font-weight:700; margin: 0 0 1rem 0; line-height:1.15; }
h1 { font-size: clamp(28px, 4.2vw, 48px); }
h2 { font-size: clamp(22px, 3.2vw, 40px); }
p { margin-bottom: 1.25rem; color: var(--text-secondary); }

section { padding: 80px 0; }

.section-title { text-align:center; margin-bottom: 3rem; }

/* Header */
header{
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    display:flex;
    align-items:center;
    transition: var(--transition);
    background: transparent; /* transparent by default */
    backdrop-filter: blur(6px);
}
header .header-inner {
    display:flex;
    justify-content: space-between;
    align-items:center;
    width:100%;
    padding: 12px 20px;
}
header.scrolled { box-shadow: 0 8px 30px var(--shadow); background-color: rgba(255,255,255,0.94); }

.logo { display:flex; align-items:center; gap:.6rem; text-decoration:none; color:var(--text); font-weight:700; font-size: 1.125rem; }
.logo-icon { width:34px; height:34px; background-color:var(--primary); display:inline-flex; align-items:center; justify-content:center; color:#fff; font-weight:700; border-radius:8px; }

nav { display:flex; align-items:center; gap: 24px; }
nav ul { display:flex; gap: 22px; list-style:none; margin:0; padding:0; align-items:center; }
nav a { color:var(--text); text-decoration:none; font-weight:500; }
nav a:hover { color: var(--primary); }

.header-cta { display:flex; gap:12px; align-items:center; }

/* Mobile menu button */
.mobile-menu-btn {
    display:none;
    background:none;
    border:0;
    font-size:1.25rem;
    color:var(--text);
    cursor:pointer;
}

/* Hero */
.hero { padding-top: calc(var(--header-height) + 80px); padding-bottom: 100px; text-align:center; background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg) 100%); }
.hero p { max-width: 680px; margin: 0 auto 1.5rem; font-size:1.05rem; }

.url-shortener { background-color: var(--bg-card); border-radius: var(--radius); padding: 30px; box-shadow: 0 10px 30px var(--shadow); max-width: 820px; margin: 0 auto 28px; }
.url-shortener h3 { text-align:center; margin-bottom: 18px; color: var(--primary); }

.shortener-form { display:flex; gap:10px; align-items:center; }
.shortener-form input[type="url"]{
    flex:1;
    padding:14px 16px;
    border:1px solid var(--border);
    border-radius: var(--radius);
    font-size:16px;
}
.shortener-form button { padding:14px 20px; white-space:nowrap; }

.shortener-result { margin-top:18px; padding:12px; background-color: var(--primary-light); border-radius: var(--radius); display:none; align-items:center; justify-content:space-between; gap:12px; }
.shortener-result.show { display:flex; }
.result-url { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Roboto Mono", monospace; color:var(--primary); font-weight:600; overflow-wrap:anywhere; }

.copy-btn { background-color: var(--primary); color:white; border:none; padding:8px 14px; border-radius:8px; cursor:pointer; }

/* value bullets */
.value-bullets { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; max-width: 920px; margin: 0 auto 3rem; padding: 25px; }
.value-bullet { padding: 28px 20px; background-color: var(--bg-card); border-radius: var(--radius); text-align:center; box-shadow: 0 6px 18px var(--shadow); transition: var(--transition); }
.value-bullet:hover { transform: translateY(-6px); box-shadow: 0 14px 30px var(--shadow-hover); }
.value-bullet .icon { width:70px; height:70px; border-radius:50%; display:flex; align-items:center; justify-content:center; color:white; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); margin:0 auto 18px; font-size:1.2rem; }

/* features */
.features { background-color: var(--bg-light); }
.features-grid { display:grid; grid-template-columns: repeat(2, 1fr); gap:30px; }
.feature-card { background:var(--bg-card); padding: 28px; border-radius: var(--radius); box-shadow: 0 6px 18px var(--shadow); transition: var(--transition); }
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 14px 30px var(--shadow-hover); }
.feature-card .icon { width:60px; height:60px; border-radius:12px; display:flex; align-items:center; justify-content:center; color:white; background: linear-gradient(135deg,var(--primary),var(--primary-dark)); margin-bottom:18px; font-size:1.2rem; }

/* pricing */
.pricing-cards { display:grid; grid-template-columns: repeat(3, 1fr); gap:30px; }
.pricing-card { background:var(--bg-card); padding: 36px 28px; border-radius: var(--radius); position: relative; box-shadow: 0 6px 18px var(--shadow); transition: var(--transition); }
.pricing-card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px var(--shadow-hover); }
.pricing-card.recommended { border: 2px solid var(--primary); transform: scale(1.03); }
.pricing-card.recommended::before { content: "Recommended"; position:absolute; top:-12px; left:50%; transform: translateX(-50%); background:var(--primary); color:#fff; padding:6px 14px; border-radius:20px; font-size:.85rem; font-weight:600; }

.price { font-size: 2.1rem; font-weight:700; margin: 10px 0; color:var(--primary); }
.price-period { color: var(--text-light); font-size: .95rem; }

.pricing-features { list-style:none; padding:0; margin: 24px 0; }
.pricing-features li { margin-bottom:10px; padding-left:22px; position:relative; color:var(--text-secondary); }
.pricing-features li::before { content: "✓"; position:absolute; left:0; color:var(--primary); font-weight:700; }

/* demo */
.demo { background-color: var(--bg-light); text-align:center; }
.demo-container { max-width: 880px; margin:0 auto; }
.demo-visual { background: var(--bg-card); border-radius: var(--radius); padding: 30px; box-shadow: 0 10px 30px var(--shadow); margin-top: 22px; }
.demo-stats { display:grid; grid-template-columns: repeat(4, 1fr); gap:20px; margin-bottom:18px; }
.demo-stat { background: var(--bg-light); padding:18px; border-radius:10px; }
.demo-stat-value { font-size: 1.6rem; font-weight:700; color:var(--primary); }
.demo-stat-label { font-size:.9rem; color:var(--text-light); }

/* footer */
footer { background: var(--bg-card); padding: 60px 0 30px; border-top:1px solid var(--border); }
.footer-content { display:grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap:40px; margin-bottom: 32px; }
.footer-logo a.logo { font-size:1.1rem; }
.footer-tagline { color:var(--text-secondary); margin-bottom:10px; }
.footer-links ul { list-style:none; padding:0; margin:0; }
.footer-links ul li { margin-bottom:10px; }
.footer-links ul li a { color:var(--text-secondary); text-decoration:none; transition: var(--transition); }
.footer-links ul li a:hover { color:var(--primary); }

.newsletter-form { display:flex; gap:10px; }
.newsletter-form input { flex:1; padding:12px 14px; border:1px solid var(--border); border-radius: var(--radius); font-size:14px; }

.footer-bottom { border-top:1px solid var(--border); padding-top:20px; display:flex; justify-content:space-between; align-items:center; color:var(--text-light); font-size:0.9rem; }
.social-icons { display:flex; gap:12px; }
.social-icon { width:36px; height:36px; background:var(--bg-light); border-radius:50%; display:inline-flex; align-items:center; justify-content:center; color:var(--text); text-decoration:none; transition: var(--transition); }
.social-icon:hover { background:var(--primary); color:#fff; transform: translateY(-3px); }

/* toast */
.toast { position: fixed; bottom: 20px; right: 20px; background-color: var(--primary); color: #fff; padding: 12px 18px; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.12); transform: translateY(100px); opacity:0; transition: transform .35s ease, opacity .35s ease; z-index: 3000; }
.toast.show { transform: translateY(0); opacity:1; }
.toast[aria-live="polite"] { min-width: 180px; }

/* Animations & reveal */
.reveal { opacity:0; transform: translateY(18px); transition: opacity .5s ease, transform .5s ease; }
.reveal.inview { opacity:1; transform: translateY(0); }

/* Responsive */
@media (max-width: 992px) {
    .value-bullets, .features-grid, .pricing-cards, .footer-content { grid-template-columns: 1fr; }
    .demo-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .header-inner { gap:12px; }
    nav { display:none; }
    .mobile-menu-btn { display:block; }
    nav.active { display:block; background: rgba(255,255,255,0.98); position: absolute; left:0; right:0; top: var(--header-height); padding: 14px 20px; box-shadow: 0 8px 30px var(--shadow); }
    nav ul { flex-direction: column; gap:12px; align-items:center; }
    .header-cta { width:100%; justify-content:center; margin-top:8px; }
    .hero { padding-top: calc(var(--header-height) + 64px); }
    .demo-stats { grid-template-columns: repeat(2, 1fr); }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}