/* ===== Reset & Base ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;line-height:1.7;color:#111827;background:#fff}
img{max-width:100%;height:auto;display:block}
a{color:#2563eb;text-decoration:none;transition:color .2s}
a:hover{color:#1d4ed8;text-decoration:underline}
table{border-collapse:collapse;width:100%}

/* ===== Variables ===== */
:root{
--primary:#2563eb;--primary-dark:#1d4ed8;--primary-light:#dbeafe;
--accent:#f59e0b;--accent-dark:#d97706;
--success:#059669;--danger:#dc2626;
--dark:#0f172a;--gray-900:#111827;--gray-700:#374151;
--gray-500:#6b7280;--gray-300:#d1d5db;--gray-100:#f3f4f6;--gray-50:#f9fafb;
--max-width:1140px;--radius:12px;--radius-sm:8px;
--shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -2px rgba(0,0,0,.1);
--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -4px rgba(0,0,0,.1);
--shadow-xl:0 20px 25px -5px rgba(0,0,0,.1),0 8px 10px -6px rgba(0,0,0,.1);
}

/* ===== Typography ===== */
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3;color:var(--dark)}
h1{font-size:clamp(1.75rem,5vw,2.5rem);margin-bottom:1rem}
h2{font-size:clamp(1.5rem,4vw,2rem);margin:2.5rem 0 1rem}
h3{font-size:clamp(1.25rem,3vw,1.5rem);margin:2rem 0 .75rem}
h4{font-size:1.125rem;margin:1.5rem 0 .5rem}
p{margin-bottom:1rem}
ul,ol{margin-bottom:1rem;padding-left:1.5rem}
li{margin-bottom:.5rem}

/* ===== Layout ===== */
.container{max-width:var(--max-width);margin:0 auto;padding:0 1.5rem}
.content{max-width:800px;margin:0 auto;padding:0 1.5rem}
section{padding:3rem 0}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--gray-100)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem}
.logo{font-size:1.25rem;font-weight:800;color:var(--dark);text-decoration:none}
.logo span{color:var(--primary)}
.main-nav ul{display:flex;gap:1.5rem;list-style:none;padding:0;margin:0}
.main-nav a{color:var(--gray-700);font-weight:500;font-size:.95rem}
.main-nav a:hover{color:var(--primary);text-decoration:none}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#eff6ff 0%,#f0f9ff 100%);padding:4rem 0 3rem;text-align:center}
.hero h1{max-width:800px;margin:0 auto 1rem}
.hero p{font-size:1.125rem;color:var(--gray-700);max-width:600px;margin:0 auto 2rem}
.hero-image{max-width:900px;margin:2rem auto;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-xl)}
.hero-image img{width:100%}

/* ===== Quick Answer ===== */
.quick-answer{background:var(--gray-50);border:1px solid var(--gray-100);border-left:4px solid var(--primary);border-radius:var(--radius);padding:1.5rem;margin:2rem 0}
.quick-answer h2{margin-top:0;font-size:1.25rem}
.quick-answer ul{margin-bottom:0}

/* ===== Service Cards ===== */
.service-card{background:#fff;border:1px solid var(--gray-100);border-radius:var(--radius);padding:2rem;margin-bottom:2rem;box-shadow:var(--shadow);transition:box-shadow .3s,transform .3s}
.service-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.service-card.featured{border-color:var(--primary);border-width:2px;position:relative}
.service-card .rank-badge{position:absolute;top:-12px;left:1.5rem;background:var(--accent);color:#fff;padding:.25rem .75rem;border-radius:20px;font-size:.875rem;font-weight:700}
.service-card h3{margin-top:0}
.service-card .rating{color:var(--accent);font-size:1.25rem;margin:.5rem 0}
.service-card .service-link{display:inline-block;color:var(--primary);font-weight:600;margin:.5rem 0}
.service-card .pros{list-style:none;padding:0;margin:1rem 0}
.service-card .pros li{padding-left:1.5rem;position:relative;margin-bottom:.5rem}
.service-card .pros li::before{content:"✓";color:var(--success);font-weight:700;position:absolute;left:0}

/* ===== CTA Block ===== */
.cta-block{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;border-radius:var(--radius);padding:2.5rem;text-align:center;margin:2.5rem 0;box-shadow:var(--shadow-lg)}
.cta-block h3{color:#fff;margin-top:0}
.cta-block p{color:rgba(255,255,255,.9)}
.cta-button{display:inline-block;background:var(--accent);color:#fff;padding:.875rem 2rem;border-radius:var(--radius-sm);font-weight:700;text-decoration:none;transition:background .2s,transform .2s;border:none;cursor:pointer;font-size:1rem}
.cta-button:hover{background:var(--accent-dark);color:#fff;text-decoration:none;transform:scale(1.05)}

/* ===== Table ===== */
.comparison-table{width:100%;border-collapse:collapse;margin:2rem 0;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.comparison-table th{background:var(--dark);color:#fff;padding:1rem;text-align:left;font-weight:600}
.comparison-table td{padding:1rem;border-bottom:1px solid var(--gray-100)}
.comparison-table tr:last-child td{border-bottom:none}
.comparison-table tr:hover{background:var(--gray-50)}

/* ===== Checklist ===== */
.checklist{background:var(--gray-50);border-left:4px solid var(--success);padding:1.5rem 1.5rem 1.5rem 2rem;border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin:1.5rem 0}
.checklist ul{list-style:none;padding:0}
.checklist li{padding-left:1.75rem;position:relative;margin-bottom:.5rem}
.checklist li::before{content:"☐";position:absolute;left:0;color:var(--success);font-size:1.25rem}

/* ===== FAQ ===== */
.faq-item{border-bottom:1px solid var(--gray-100);padding:1rem 0}
.faq-item summary{cursor:pointer;font-weight:600;font-size:1.05rem;padding:.5rem 0;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.5rem;color:var(--primary);flex-shrink:0}
.faq-item[open] summary::after{content:"−"}
.faq-item .faq-answer{padding:.5rem 0 1rem;color:var(--gray-700)}

/* ===== Stats ===== */
.stats-block{background:var(--dark);color:#fff;border-radius:var(--radius);padding:2.5rem;margin:2rem 0}
.stats-block h3{color:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.5rem;margin-top:1.5rem}
.stat-item{text-align:center}
.stat-number{font-size:2.5rem;font-weight:800;color:var(--accent)}
.stat-label{color:rgba(255,255,255,.7);font-size:.9rem;margin-top:.25rem}

/* ===== Tips ===== */
.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;margin:2rem 0}
.tip-card{background:var(--gray-50);border-radius:var(--radius);padding:1.5rem;border-top:3px solid var(--primary)}
.tip-card h4{margin-top:0;color:var(--primary-dark)}

/* ===== Brainstorm ===== */
.brainstorm{background:linear-gradient(135deg,#fef3c7 0%,#fde68a 100%);border-radius:var(--radius);padding:2rem;margin:2rem 0}
.brainstorm h3{margin-top:0}
.brainstorm ul{margin-bottom:0}

/* ===== Rarely Explain ===== */
.rarely-explain{background:#f0fdf4;border-left:4px solid var(--success);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:2rem;margin:2rem 0}
.rarely-explain h3{margin-top:0;color:var(--success)}

/* ===== Video ===== */
.video-section{margin:2rem 0;text-align:center}
.video-section video{max-width:100%;border-radius:var(--radius);box-shadow:var(--shadow-lg)}

/* ===== Breadcrumb ===== */
.breadcrumb{padding:1rem 0;font-size:.875rem;color:var(--gray-500)}
.breadcrumb ol{list-style:none;display:flex;gap:.5rem;flex-wrap:wrap;padding:0;margin:0}
.breadcrumb li::after{content:"›";margin-left:.5rem;color:var(--gray-300)}
.breadcrumb li:last-child::after{content:""}
.breadcrumb a{color:var(--gray-500)}

/* ===== Language Switcher ===== */
.lang-switcher{display:flex;gap:.5rem;flex-wrap:wrap;margin:1.5rem 0}
.lang-switcher a{padding:.375rem .75rem;border:1px solid var(--gray-300);border-radius:20px;font-size:.8rem;color:var(--gray-700)}
.lang-switcher a:hover{background:var(--primary);color:#fff;border-color:var(--primary);text-decoration:none}
.lang-switcher a.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ===== Footer ===== */
.site-footer{background:var(--dark);color:rgba(255,255,255,.7);padding:3rem 0 1.5rem;margin-top:3rem}
.site-footer h4{color:#fff;margin-bottom:1rem}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem;margin-bottom:2rem}
.footer-links{list-style:none;padding:0}
.footer-links li{margin-bottom:.5rem}
.footer-links a{color:rgba(255,255,255,.7)}
.footer-links a:hover{color:#fff;text-decoration:none}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:1.5rem;text-align:center;font-size:.875rem}

/* ===== RTL ===== */
[dir="rtl"]{text-align:right}
[dir="rtl"] ul,[dir="rtl"] ol{padding-left:0;padding-right:1.5rem}
[dir="rtl"] .checklist{border-left:none;border-right:4px solid var(--success);border-radius:var(--radius-sm) 0 0 var(--radius-sm);padding:1.5rem 2rem 1.5rem 1.5rem}
[dir="rtl"] .checklist li{padding-left:0;padding-right:1.75rem}
[dir="rtl"] .checklist li::before{left:auto;right:0}
[dir="rtl"] .quick-answer{border-left:none;border-right:4px solid var(--primary)}
[dir="rtl"] .rarely-explain{border-left:none;border-right:4px solid var(--success);border-radius:var(--radius-sm) 0 0 var(--radius-sm)}
[dir="rtl"] .breadcrumb li::after{content:"‹"}
[dir="rtl"] .service-card .pros li{padding-left:0;padding-right:1.5rem}
[dir="rtl"] .service-card .pros li::before{left:auto;right:0}

/* ===== Responsive ===== */
@media(max-width:768px){
.main-nav{display:none}
.service-card{padding:1.5rem}
.cta-block{padding:1.5rem}
.stats-block{padding:1.5rem}
.comparison-table{font-size:.875rem;display:block;overflow-x:auto;white-space:nowrap}
.comparison-table th,.comparison-table td{padding:.5rem}
section{padding:2rem 0}
.hero{padding:2rem 0}
.footer-grid{grid-template-columns:1fr}
.tips-grid{grid-template-columns:1fr}
}