/* ============================================
   TheCalculatorOnline - Modern SaaS Design System
   ============================================ */

:root{
  --primary:#4f46e5;
  --primary-dark:#4338ca;
  --primary-darker:#3730a3;
  --primary-soft:#eef2ff;
  --accent:#0ea5e9;
  --success:#10b981;
  --success-soft:#ecfdf5;
  --warning:#f59e0b;
  --warning-soft:#fffbeb;
  --danger:#ef4444;
  --danger-soft:#fef2f2;
  --dark:#0f172a;
  --slate:#334155;
  --gray:#64748b;
  --muted:#94a3b8;
  --bg:#f8fafc;
  --surface:#ffffff;
  --border:#e2e8f0;
  --border-strong:#cbd5e1;
  --ring:rgba(79,70,229,.22);
  --radius:16px;
  --radius-sm:10px;
  --radius-lg:22px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06),0 1px 3px rgba(15,23,42,.06);
  --shadow:0 1px 3px rgba(15,23,42,.08),0 4px 14px -4px rgba(15,23,42,.10);
  --shadow-md:0 6px 20px -6px rgba(15,23,42,.16);
  --shadow-lg:0 18px 40px -12px rgba(15,23,42,.22);
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}

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

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--dark);
  line-height:1.6;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;display:block}
a{color:var(--primary)}

::selection{background:var(--primary);color:#fff}

/* ============ Header ============ */
header{
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:1000;
}
.header-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.logo{font-size:1.22rem;font-weight:800;letter-spacing:-.02em;color:var(--dark);text-decoration:none;display:flex;align-items:center;gap:10px}
.logo .logo-mark{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--primary),#7c3aed);display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 6px 14px -4px rgba(79,70,229,.5);flex:none}
.logo .logo-mark svg{width:20px;height:20px}
.logo b{color:var(--primary)}
nav ul{list-style:none;display:flex;gap:4px;align-items:center}
nav ul li a{color:var(--slate);text-decoration:none;padding:8px 14px;border-radius:9px;font-size:.9rem;font-weight:500;display:flex;align-items:center;gap:7px;transition:all .18s ease}
nav ul li a svg{width:17px;height:17px;color:var(--gray);transition:color .18s ease}
nav ul li a:hover{background:var(--primary-soft);color:var(--primary)}
nav ul li a:hover svg{color:var(--primary)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:8px;border-radius:8px}
.hamburger span{display:block;width:22px;height:2px;background:var(--dark);border-radius:2px;transition:.2s}

/* ============ Hero ============ */
.hero{
  position:relative;overflow:hidden;color:#fff;text-align:center;
  padding:84px 20px 72px;
  background:
    radial-gradient(1200px 600px at 80% -10%,rgba(124,58,237,.35),transparent 60%),
    radial-gradient(900px 500px at 10% 110%,rgba(14,165,233,.30),transparent 55%),
    linear-gradient(135deg,#1e1b4b 0%,#312e81 45%,#4338ca 100%);
}
.hero::after{
  content:'';position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.08) 1px,transparent 1px);
  background-size:26px 26px;
  mask-image:radial-gradient(circle at 50% 30%,#000,transparent 75%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%,#000,transparent 75%);
}
.hero .container{position:relative;z-index:2}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);color:#e0e7ff;padding:7px 16px;border-radius:999px;font-size:.82rem;font-weight:500;margin-bottom:22px;backdrop-filter:blur(4px)}
.hero-badge svg{width:15px;height:15px;color:#a5b4fc}
.hero h1{font-size:3rem;font-weight:800;letter-spacing:-.035em;line-height:1.08;margin-bottom:18px}
.hero h1 .grad{background:linear-gradient(90deg,#fbbf24,#f59e0b);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:1.12rem;color:rgba(255,255,255,.82);max-width:620px;margin:0 auto 34px}
.search-bar{display:flex;max-width:560px;margin:0 auto;background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 20px 45px -12px rgba(0,0,0,.4);align-items:center}
.search-bar .search-ico{display:flex;padding-left:16px;color:var(--muted)}
.search-bar .search-ico svg{width:19px;height:19px}
.search-bar input{flex:1;padding:15px 12px 15px 10px;border:none;outline:none;font-size:1rem;background:transparent;color:var(--dark);font-family:inherit}
.search-bar button{padding:14px 26px;background:var(--primary);color:#fff;border:none;cursor:pointer;font-weight:600;font-size:.95rem;margin:5px;border-radius:10px;transition:background .2s;font-family:inherit;white-space:nowrap}
.search-bar button:hover{background:var(--primary-dark)}

/* ============ Layout ============ */
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:56px 0}
.section-header{display:flex;align-items:center;gap:16px;margin-bottom:32px;flex-wrap:wrap}
.section-header h2{font-size:1.55rem;font-weight:800;letter-spacing:-.02em;color:var(--dark)}
.cat-icon{width:48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;flex:none;box-shadow:var(--shadow-sm)}
.cat-icon svg{width:24px;height:24px}
.section-divider{width:46px;height:4px;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:99px;margin-top:6px}
.section-header p{font-size:.92rem;color:var(--gray);margin-top:4px;margin-bottom:0}

/* ============ Tools Grid ============ */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px}
.tool-card{
  background:var(--surface);border-radius:var(--radius);padding:22px 20px;text-decoration:none;color:var(--dark);
  border:1px solid var(--border);transition:all .22s cubic-bezier(.2,.6,.3,1);display:flex;flex-direction:column;gap:12px;position:relative;overflow:hidden;
}
.tool-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));transform:scaleX(0);transition:transform .25s;transform-origin:left}
.tool-card:hover::before{transform:scaleX(1)}
.tool-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px);border-color:var(--border-strong)}
.tool-icon{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:var(--shadow-sm)}
.tool-icon svg{width:23px;height:23px}
.tool-name{font-size:.98rem;font-weight:700;line-height:1.3;letter-spacing:-.01em}
.tool-desc{font-size:.84rem;color:var(--gray);line-height:1.5}
.tool-badge{font-size:.68rem;font-weight:600;padding:4px 10px;border-radius:999px;background:var(--success-soft);color:#047857;margin-top:auto;align-self:flex-start;letter-spacing:.02em}

/* Category tile colors (set inline via --tile) */
.tool-icon{background:var(--tile,#4f46e5)}

/* ============ Stats Bar ============ */
.stats-bar{background:var(--surface);border-bottom:1px solid var(--border)}
.stats-bar .container{display:flex;gap:40px;justify-content:center;flex-wrap:wrap;padding:26px 24px}
.stat-item{text-align:center;min-width:110px}
.stat-item strong{font-size:1.7rem;font-weight:800;letter-spacing:-.02em;color:var(--dark);display:block;line-height:1.2}
.stat-item span{font-size:.8rem;color:var(--gray);font-weight:500}
.stat-item .dot{width:8px;height:8px;border-radius:50%;display:inline-block;margin-bottom:6px}

/* ============ Tool Page ============ */
.tool-page{max-width:920px;margin:40px auto;padding:0 24px}
.tool-page-header{text-align:center;margin-bottom:34px}
.tool-page-header h1{font-size:2rem;font-weight:800;letter-spacing:-.025em;color:var(--dark);margin-bottom:12px;display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap}
.tool-page-header p{color:var(--gray);font-size:1rem;max-width:600px;margin:0 auto}

.page-icon{display:inline-flex;width:52px;height:52px;align-items:center;justify-content:center;color:#fff;background:linear-gradient(135deg,var(--primary),#7c3aed);border-radius:14px;box-shadow:0 10px 22px -8px rgba(79,70,229,.5);flex:none;vertical-align:middle}
.page-icon svg{width:24px;height:24px}
.tool-box{background:var(--surface);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);border:1px solid var(--border);margin-bottom:28px}

/* ============ Forms ============ */
textarea,input[type=text],input[type=number],input[type=email],input[type=date],input[type=url],select{
  width:100%;padding:11px 15px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:.95rem;
  font-family:inherit;transition:border-color .18s,box-shadow .18s;background:var(--surface);color:var(--dark);
}
textarea:focus,input[type=text]:focus,input[type=number]:focus,input[type=email]:focus,input[type=date]:focus,input[type=url]:focus,select:focus{
  outline:none;border-color:var(--primary);box-shadow:0 0 0 4px var(--ring)
}
textarea{resize:vertical;min-height:140px;line-height:1.55}
.label{display:block;font-weight:600;margin-bottom:8px;font-size:.88rem;color:var(--dark);letter-spacing:-.01em}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 22px;border-radius:11px;border:none;cursor:pointer;font-size:.93rem;font-weight:600;transition:all .18s ease;text-decoration:none;font-family:inherit;line-height:1.4}
.btn svg{width:17px;height:17px}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 14px -6px rgba(79,70,229,.55)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 10px 20px -8px rgba(79,70,229,.6)}
.btn-secondary{background:var(--light-gray,#f1f5f9);color:var(--dark)}
.btn-secondary:hover{background:var(--border)}
.btn-success{background:var(--success);color:#fff}
.btn-success:hover{background:#059669}
.btn-danger{background:var(--danger);color:#fff}
.btn-group{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.input-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.input-group{display:flex;gap:10px;align-items:center}

/* ============ Results ============ */
.result-box{background:var(--primary-soft);border:1px solid #e0e7ff;border-radius:var(--radius-sm);padding:20px;margin-top:20px;border-left:4px solid var(--primary)}
.result-box h3{font-size:.76rem;text-transform:uppercase;color:var(--primary);letter-spacing:.08em;margin-bottom:10px;font-weight:700}
.result-value{font-size:2rem;font-weight:800;color:var(--primary);letter-spacing:-.02em;line-height:1.2}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:14px;margin-top:20px}
.stat-card{background:var(--surface);border-radius:var(--radius-sm);padding:18px 14px;text-align:center;border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:all .18s ease}
.stat-card:hover{box-shadow:var(--shadow)}
.stat-number{font-size:1.65rem;font-weight:800;color:var(--primary);display:block;letter-spacing:-.02em}
.stat-label{font-size:.74rem;color:var(--gray);margin-top:4px;font-weight:500}

/* ============ Article ============ */
.article-section{background:var(--surface);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow);border:1px solid var(--border);margin-bottom:28px}
.article-section h2{font-size:1.4rem;font-weight:800;color:var(--dark);margin-bottom:16px;padding-bottom:14px;border-bottom:2px solid var(--border);letter-spacing:-.02em}
.article-section h3{font-size:1.1rem;font-weight:700;color:var(--dark);margin:24px 0 10px;letter-spacing:-.01em}
.article-section p{color:#475569;line-height:1.8;margin-bottom:14px}
.article-section ul,.article-section ol{padding-left:22px;margin-bottom:14px;color:#475569}
.article-section li{margin-bottom:8px;line-height:1.7}
.article-section code{background:var(--light-gray,#f1f5f9);padding:2px 7px;border-radius:6px;font-size:.88em;color:var(--primary-dark);font-family:'SFMono-Regular',Consolas,monospace}

/* ============ Breadcrumb ============ */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:.84rem;color:var(--gray);padding:16px 0;flex-wrap:wrap}
.breadcrumb a{color:var(--gray);text-decoration:none;display:inline-flex;align-items:center;gap:6px}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:var(--muted)}
.breadcrumb span{color:var(--dark);font-weight:600}

/* ============ Ads ============ */
.ad-slot{background:var(--surface);border:1.5px dashed var(--border-strong);border-radius:var(--radius-sm);text-align:center;padding:22px;color:var(--muted);font-size:.78rem;margin:24px 0;letter-spacing:.02em}

/* ============ Footer ============ */
footer{background:#0f172a;color:#cbd5e1;padding:64px 0 24px;margin-top:72px;position:relative}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 24px}
.footer-grid{display:grid;grid-template-columns:2.2fr 1fr 1fr 1fr;gap:40px;margin-bottom:44px}
.footer-brand .logo{color:#fff;font-size:1.25rem;margin-bottom:6px}
.footer-brand .logo b{color:#a5b4fc}
.footer-brand p{font-size:.88rem;line-height:1.7;margin-top:14px;color:#94a3b8;max-width:320px}
.footer-col h4{color:#fff;font-size:.86rem;font-weight:700;margin-bottom:16px;letter-spacing:.02em;text-transform:uppercase}
.footer-col ul{list-style:none}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{color:#94a3b8;text-decoration:none;font-size:.88rem;transition:color .18s}
.footer-col ul li a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;font-size:.82rem;color:#64748b}
.footer-bottom a{color:#94a3b8;text-decoration:none}
.footer-bottom a:hover{color:#fff}

/* ============ Static Pages ============ */
.static-page{max-width:840px;margin:40px auto;padding:0 24px 56px}
.static-page h1{font-size:2rem;font-weight:800;color:var(--dark);margin-bottom:8px;letter-spacing:-.02em}
.static-page .meta{color:var(--gray);font-size:.88rem;margin-bottom:28px;padding-bottom:18px;border-bottom:2px solid var(--border)}
.static-page h2{font-size:1.3rem;font-weight:700;color:var(--dark);margin:28px 0 10px;letter-spacing:-.01em}
.static-page p,.static-page li{color:#475569;line-height:1.8;margin-bottom:12px}
.static-page ul,.static-page ol{padding-left:22px;margin-bottom:16px}

/* ============ Contact ============ */
.contact-form .form-group{margin-bottom:18px}
.contact-form label{display:block;font-weight:600;margin-bottom:6px;font-size:.88rem;color:var(--dark)}
.contact-form .form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* ============ Table ============ */
.data-table{width:100%;border-collapse:collapse;margin-top:16px;font-size:.9rem}
.data-table th{background:#f8fafc;color:var(--slate);padding:12px 14px;text-align:left;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;font-weight:700;border-bottom:1px solid var(--border)}
.data-table td{padding:12px 14px;border-bottom:1px solid var(--border);color:#334155}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:hover td{background:#f8fafc}

/* ============ Alert ============ */
.alert{padding:13px 16px;border-radius:var(--radius-sm);margin-bottom:16px;font-size:.88rem;font-weight:500;border:1px solid transparent}
.alert-info{background:var(--primary-soft);color:var(--primary-dark);border-color:#e0e7ff}
.alert-success{background:var(--success-soft);color:#065f46;border-color:#d1fae5}
.alert-warning{background:var(--warning-soft);color:#92400e;border-color:#fef3c7}
.alert-danger{background:var(--danger-soft);color:#991b1b;border-color:#fee2e2}

/* ============ Misc ============ */
.color-preview{width:100%;height:110px;border-radius:var(--radius-sm);border:1px solid var(--border);transition:background .3s}
input[type=range]{width:100%;height:6px;border-radius:99px;background:var(--border);outline:none;border:none;padding:0;cursor:pointer;accent-color:var(--primary)}
input[type=checkbox],input[type=radio]{accent-color:var(--primary);width:16px;height:16px;cursor:pointer}
label[for]{cursor:pointer}

#toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:#0f172a;color:#fff;padding:13px 24px;border-radius:12px;font-size:.88rem;font-weight:600;z-index:9999;opacity:0;transition:opacity .3s;box-shadow:var(--shadow-lg);pointer-events:none;letter-spacing:-.01em}

/* ============ Utility ============ */
.text-center{text-align:center}
.text-muted{color:var(--gray);font-size:.85rem}
.mt-20{margin-top:20px}
.mb-20{margin-bottom:20px}
.hidden{display:none}

/* Why Us feature cards */
.why-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:22px;max-width:960px;margin:0 auto}
.feature-card{padding:28px 24px;background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);text-align:left;transition:all .22s ease}
.feature-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}
.feature-card .feature-ico{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;margin-bottom:16px}
.feature-card .feature-ico svg{width:23px;height:23px}
.feature-card h3{font-weight:700;margin-bottom:8px;font-size:1.02rem;letter-spacing:-.01em}
.feature-card p{font-size:.87rem;color:var(--gray);line-height:1.6}

/* ============ Responsive ============ */
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;gap:32px}}
@media(max-width:768px){
  .hero h1{font-size:2.15rem}
  .hero{padding:56px 20px 48px}
  .tools-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
  nav{display:none;position:absolute;top:68px;left:0;right:0;background:var(--surface);padding:14px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-md)}
  nav.open{display:block}
  nav ul{flex-direction:column;gap:3px}
  nav ul li a{padding:12px 14px}
  .hamburger{display:flex}
  .contact-form .form-row{grid-template-columns:1fr}
  .tool-box{padding:20px}
  .article-section{padding:22px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .input-row{grid-template-columns:1fr}
  .footer-bottom{justify-content:center;text-align:center}
}
@media(max-width:480px){
  .tools-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:1.7rem}
  .footer-grid{grid-template-columns:1fr}
  .section-header h2{font-size:1.3rem}
  .tool-page-header h1{font-size:1.55rem}
}