@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-color: #f8fafc;
    --text-color: #0f172a;
    --text-muted: #475569;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #10b981;
    --card-bg: rgba(255, 255, 255, 0.85);
    --border-color: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    --nav-height: 70px;
    --radius: 12px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --primary-color: #60a5fa;
    --primary-hover: #3b82f6;
    --card-bg: rgba(30, 41, 59, 0.85);
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    transition: var(--transition);
    overflow-x: hidden;
}

a { color: var(--primary-color); text-decoration: none; }
a:hover { text-decoration: underline; }

.glass {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius);
}

header {
    position: fixed;
    top: 0; width: 100%; height: var(--nav-height);
    z-index: 1000;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 2rem; transition: var(--transition);
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 1.5rem; font-weight: 800; color: var(--primary-color) !important;
    text-decoration: none !important; display: flex; align-items: center; gap: 0.5rem;
}

.nav-links { display: flex; gap: 1.5rem; list-style: none; }
.nav-links a { text-decoration: none !important; color: var(--text-color); font-weight: 500; transition: var(--transition); }
.nav-links a:hover { color: var(--primary-color); }
.nav-links a.active { color: var(--primary-color); font-weight: 700; }

.header-actions { display: flex; align-items: center; gap: 1rem; }
.theme-toggle, .mobile-menu-btn {
    background: none; border: none; color: var(--text-color);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    padding: 0.5rem; border-radius: 50%; transition: var(--transition);
}
.theme-toggle:hover { background: rgba(128,128,128,0.1); }
.mobile-menu-btn { display: none; }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    padding: 0.75rem 1.5rem; background: var(--primary-color); color: #fff !important;
    border: none; border-radius: var(--radius); font-weight: 600;
    text-decoration: none !important; cursor: pointer; transition: var(--transition);
}
.btn:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3); }
.btn-secondary { background: transparent; color: var(--primary-color) !important; border: 2px solid var(--primary-color); }
.btn-secondary:hover { background: rgba(59, 130, 246, 0.1); }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.7; cursor: not-allowed; transform: none !important; box-shadow: none !important; }

main {
    margin-top: var(--nav-height);
    min-height: calc(100vh - var(--nav-height) - 100px);
    padding: 2rem; max-width: 1200px; margin: var(--nav-height) auto 0;
}

.hero { text-align: center; padding: 5rem 1rem; }
.hero h1 { font-size: 3.5rem; font-weight: 800; margin-bottom: 1.5rem; line-height: 1.2; letter-spacing: -0.03em; }
.hero h1 span { color: var(--primary-color); }
.hero p { font-size: 1.25rem; color: var(--text-muted); margin-bottom: 2.5rem; max-width: 700px; margin-left: auto; margin-right: auto; }
.hero-actions { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }

section { padding: 4rem 0; }
.section-title { text-align: center; font-size: 2.5rem; margin-bottom: 3rem; font-weight: 800; letter-spacing: -0.02em; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.card { padding: 2.5rem; transition: var(--transition); text-align: left; display: flex; flex-direction: column; }
.card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px rgba(0,0,0,0.1); border-color: var(--primary-color); }
.card svg { width: 48px; height: 48px; color: var(--primary-color); margin-bottom: 1.5rem; }
.card h3 { margin-bottom: 1rem; font-size: 1.5rem; font-weight: 700; }
.card p { color: var(--text-muted); flex-grow: 1; margin: 0; }

.tool-container { display: grid; grid-template-columns: 350px 1fr; gap: 2rem; align-items: start; }
.tool-sidebar { padding: 2rem; position: sticky; top: 100px; z-index: 10; }
.tool-results-area { padding: 2rem; min-height: 500px; display: flex; flex-direction: column; }

.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; font-size: 0.95rem; }
.form-control {
    width: 100%; padding: 0.85rem 1rem; border: 1px solid var(--border-color);
    border-radius: var(--radius); background: var(--bg-color); color: var(--text-color);
    font-family: inherit; font-size: 1rem; transition: var(--transition);
}
.form-control:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15); }

.results-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; border-bottom: 1px solid var(--border-color); padding-bottom: 1rem; flex-wrap: wrap; gap: 1rem; }
.results-list { display: flex; flex-direction: column; gap: 1rem; }
.result-item { padding: 1.5rem; display: flex; justify-content: space-between; align-items: center; gap: 1rem; transition: var(--transition); background: var(--bg-color); border: 1px solid var(--border-color); border-radius: var(--radius); }
.result-item:hover { border-color: var(--primary-color); transform: translateX(5px); box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
.result-text { font-size: 1.15rem; font-weight: 600; line-height: 1.4; flex-grow: 1; margin: 0; }
.result-actions { display: flex; gap: 0.5rem; }
.icon-btn { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 8px; width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); cursor: pointer; transition: var(--transition); }
.icon-btn:hover { color: var(--primary-color); border-color: var(--primary-color); background: rgba(59, 130, 246, 0.05); }

.loader {
    border: 3px solid var(--border-color); border-top: 3px solid var(--primary-color);
    border-radius: 50%; width: 40px; height: 40px; animation: spin 1s linear infinite; margin: 3rem auto;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

footer { background: var(--card-bg); border-top: 1px solid var(--border-color); padding: 4rem 2rem 2rem; margin-top: 4rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; max-width: 1200px; margin: 0 auto 3rem; }
.footer-col h4 { margin-bottom: 1.5rem; font-size: 1.1rem; font-weight: 700; color: var(--text-color); }
.footer-col p { color: var(--text-muted); margin-bottom: 1.5rem; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.75rem; }
.footer-col a { color: var(--text-muted); text-decoration: none !important; transition: var(--transition); }
.footer-col a:hover { color: var(--primary-color); }
.footer-bottom { text-align: center; color: var(--text-muted); padding-top: 2rem; border-top: 1px solid var(--border-color); font-size: 0.9rem; }

.faq-item { border-bottom: 1px solid var(--border-color); padding: 1.5rem 0; }
.faq-question { font-size: 1.2rem; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; color: var(--text-color); }
.faq-answer { margin-top: 1rem; color: var(--text-muted); display: none; line-height: 1.7; }
.faq-item.active .faq-answer { display: block; }
.faq-item.active .faq-icon { transform: rotate(180deg); color: var(--primary-color); }
.faq-icon { transition: var(--transition); }

.blog-header { text-align: center; padding: 4rem 0 2rem; }
.blog-content { max-width: 800px; margin: 0 auto; font-size: 1.1rem; }
.blog-content h2 { margin: 3rem 0 1rem; font-size: 2rem; font-weight: 700; letter-spacing: -0.01em; }
.blog-content h3 { margin: 2rem 0 1rem; font-size: 1.5rem; font-weight: 600; }
.blog-content p { margin-bottom: 1.5rem; color: var(--text-color); line-height: 1.8; }
.blog-content ul, .blog-content ol { margin-bottom: 1.5rem; padding-left: 1.5rem; color: var(--text-color); line-height: 1.8; }
.blog-content li { margin-bottom: 0.5rem; }
.blog-content img { max-width: 100%; border-radius: var(--radius); margin: 2rem 0; }

.table-of-contents { background: var(--bg-color); border: 1px solid var(--border-color); padding: 2rem; border-radius: var(--radius); margin-bottom: 3rem; }
.table-of-contents ul { list-style: none; padding: 0; margin: 0; }
.table-of-contents li { margin-bottom: 0.75rem; }

#backToTop { position: fixed; bottom: 2rem; right: 2rem; background: var(--primary-color); color: #fff; width: 45px; height: 45px; border-radius: 50%; border: none; display: flex; align-items: center; justify-content: center; cursor: pointer; opacity: 0; pointer-events: none; transition: var(--transition); z-index: 999; box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4); }
#backToTop.show { opacity: 1; pointer-events: auto; }
#backToTop:hover { transform: translateY(-5px); background: var(--primary-hover); }

.newsletter-box { background: var(--primary-color); color: white; padding: 4rem 2rem; border-radius: var(--radius); text-align: center; margin: 4rem 0; box-shadow: 0 20px 40px rgba(59, 130, 246, 0.2); }
.newsletter-box h2 { font-size: 2.5rem; margin-bottom: 1rem; font-weight: 800; color: white; }
.newsletter-box p { font-size: 1.1rem; margin-bottom: 2rem; opacity: 0.9; }
.newsletter-form { display: flex; gap: 1rem; max-width: 500px; margin: 0 auto; flex-wrap: wrap; }
.newsletter-form input { flex-grow: 1; padding: 1rem; border-radius: 8px; border: none; font-size: 1rem; }
.newsletter-form button { background: #0f172a; color: white; border: none; padding: 1rem 2rem; border-radius: 8px; font-weight: 600; cursor: pointer; transition: var(--transition); }
.newsletter-form button:hover { background: #1e293b; }

.testimonial { background: var(--bg-color); padding: 2rem; border-radius: var(--radius); border: 1px solid var(--border-color); }
.testimonial-text { font-style: italic; margin-bottom: 1.5rem; font-size: 1.1rem; }
.testimonial-author { display: flex; align-items: center; gap: 1rem; }
.author-avatar { width: 50px; height: 50px; border-radius: 50%; background: var(--primary-color); display: flex; align-items: center; justify-content: center; color: white; font-weight: bold; font-size: 1.2rem; }

@media (max-width: 992px) {
    .tool-container { grid-template-columns: 1fr; }
    .tool-sidebar { position: static; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; position: absolute; top: var(--nav-height); left: 0; width: 100%; background: var(--card-bg); backdrop-filter: blur(12px); flex-direction: column; padding: 1.5rem; box-shadow: var(--glass-shadow); border-bottom: 1px solid var(--border-color); text-align: center; }
    .nav-links.active { display: flex; }
    .mobile-menu-btn { display: flex; }
    .hero h1 { font-size: 2.5rem; }
    .footer-grid { grid-template-columns: 1fr; }
    .section-title { font-size: 2rem; }
    .newsletter-form { flex-direction: column; }
    .tool-results-area { padding: 1rem; }
    .blog-content { padding: 1.5rem !important; }
}